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Anatomy BLOCK 3 > Blood Vessels, Nerve, And Viscera Of The Neck > Flashcards

Blood Vessels, Nerve, And Viscera Of The Neck Flashcards

1
Q

Where does the right common carotid artery originate from?

A

Brachiocephalic trunk

-posterior to right sternoclavicular joint

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2
Q

Where does the left common carotid artery originate from?

A

Aortic arch in superior mediastinum

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3
Q

Where does common carotid ascend?

A

In neck within carotid sheath

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4
Q

Where does common carotid divide?

A

Upper border of thyroid cartilage

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5
Q

What does the common carotid divide into at the upper border of thyroid cartilage?

A

External and internal carotid arteries

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6
Q

What is within the carotid sheath?

A

Internal jugular vein
Common carotid
Vagus nerve

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7
Q

How are the contents of the carotid sheath organized?

A

Internal jugular vein lies lateral to common carotid artery, and vagus nerve lies between common carotid artery and internal jugular vein, posteriorly

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8
Q

What is the terminal part of common carotid/beginning of internal carotid artery?

A

Localized dilation called carotid sinus

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9
Q

What is the highly vascularized epithelial structure located at the carotid bifurcation?

A

Carotid body

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10
Q

What does the carotid body contain?

A

Special nerve endings, mainly derived from glossopharyngeal nerve, which respond to chemical changes in blood composition, chemoreceptors

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11
Q

What does the carotid sinus have?

A

Wall contains numerous nerve endings, mainly derived from glossopharyngeal nerve, which are sensitive to changes in blood pressure (baroreceptors/pressoreceptors)

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12
Q

What are the carotid body and sinus important for?

A

Reflex control of heart rate, blood pressure, and rspiratory rate and depth

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13
Q

Where does the external carotid begin?

A

Upper border of thyroid cartilage

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14
Q

Where does the external carotid ascend into?

A

Carotid triangle

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15
Q

Where does the external carotid artery leave the carotid triangle?

A

As it passes deep (medial) to posterior belly of digastric and stylohyoid

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16
Q

Where does the external carotid terminate?

A

Within substance of parotid gland, posterior to neck of mandible, dividing into superficial temporal and maxillary arteries

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17
Q

What does the external carotid divide into?

A

Superficial temporal and maxillary arteries

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18
Q

Anterior branches of the external carotid

A
  • superior thyroid
  • lingual
  • facial
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19
Q

Posterior branches of the external carotid artery

A
  • occipital

- posterior auricular

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20
Q

Medial branch of the external carotid artery

A

Ascending pharyngeal artery

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21
Q

Terminal branches of the external carotid artery

A

Superficial temporal and maxillary arteries

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22
Q

Where does the superior thyroid artery originate from?

A

Initial part of external carotid artery

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23
Q

Superior thyroid artery route

A

Descends almost vertically to reach upper pole of lobe of thyroid gland and contributes to its blood supply

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24
Q

What artery does the superior thyroid artery give off?

A

Superior laryngeal artery (pierces thyrohyoid membrane with internal laryngeal nerve)

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25
Q

Lingual artery originates from where?

A

External carotid artery opposite tip of greater horn of hyoid

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26
Q

Lingual artery route

A

Initial segment is crossed superficially (laterally) by hypoglossal nerve.
Passes deep to hypoglossus muscle

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27
Q

What branches does the lingual artery give off?

A

Branches that supply the tongue

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28
Q

Where does the facial artery originate?

A

Immediately above the lingual artery (sometimes by a common trunk with it)

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29
Q

Facial artery route

A

Ascends medial (deep) to posterior belly of digastric and stylohyoid muscles, arches over these two muscles an submandibular gland, curves around inferior border of mandible (anterior to masseter) to enter face

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30
Q

What branches do the facial nerve give off?

A

Before it enters the face, it gives off branches that contribute to supply pharynx, soft palate, palatine tonsil, submandibular gland, and neighboring muscles

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31
Q

Where does the occipital artery originate from?

A

Posterior aspect of external carotid artery, close to inferior border of posterior belly of digastric

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32
Q

What is the route of the occipital artery?

A

Passes posteriorly and superiorly, deep (medial) to posterior belly of digastric and mastoid process, reaches back of scalp, its terminal branches accompany branches of greater occipital nerve and supply posterior part of scalp

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33
Q

What branches come off of the occipital artery?

A

Supply auricle, middle ear, mastoid air cells, cranial dura mater, and neighboring muscles

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34
Q

Where does the posterior auricular artery originate?

A

Arises from posterior aspect of external carotid artery at upper border of posterior belly of digastric

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35
Q

What is the route of the posterior auricular artery?

A

Passes posteriorly and superiorly to reach notch between cartilage of external acoustic meatus and mastoid process

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36
Q

What does the posterior auricular artery supply

A 
Auricle
Middle ear
Scalp above and behind ear
Parotid gland
Neighboring muscles
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37
Q

Origin of ascending pharyngeal artery

A

Smallest branch of external carotid artery, arises near its origin

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38
Q

Pathway of ascending pharyngeal artery

A

Ascends along pharyngeal wall toward cranial base, medial to internal carotid artery

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39
Q

What does the ascending pharyngeal artery supply?

A 
Pharynx
Soft palate
Palatine tonsils
Middle ear
Cranial dura mater
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40
Q

Where does the superficial temporal artery originate?

A

Upward continuation of external carotid artery

-terminal branch

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41
Q

What is the route of the superficial temporal artery?

A
  • Upward continuation of external carotid artery
  • ascends anterior to ear with auriculotemporal nerve and superficial temporal vein, passes superficial (latera) to root of zygomatic process of temporal bone
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42
Q

What does the superficial temporal artery divide into?

A

Superior to zygomatic process of temporal bone, it divides into anterior (frontal) and posterior (parietal) branches

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43
Q

What does the superficial temporal artery supply

A

Frontal, temporal, and parietal regions of scalp

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44
Q

What does the superficial artery give branches to?

A

Parotid gland, external ear, face, and temporomandibular joint

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45
Q

What is the largest of the two terminal branches of external carotid artery?

A

Maxillary artery

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46
Q

How does the maxillary artery run?

A
  • Passes anteriorly, deep to neck of mandible

- runs through infratemporal fossa, and terminates in pterygopalatine fossa

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47
Q

What do the branches of the maxillary artery supply?

A
  • external and middle ear
  • cranial dura mater
  • upper and lower teeth and gingiva
  • muscles of mastication
  • face
  • hard and soft palate
  • palatine tonsil
  • nasal cavity
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48
Q

What does the internal jugular vein do?

A

Collects most venous blood from head and neck

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49
Q

Where does the internal jugular vein being?

A

In jugular foramen, as a continuation of sigmoid sinus

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50
Q

Where does the internal jugular vein end?

A

Posterior to the sternoclavicular joint, where it joins subclavian vein to form brachiocephalic vein

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51
Q

Where does the internal jugular vein lie?

A

Within the carotid sheath, lateral to internal carotid artery (in upper neck), and lateral to common carotid artery (in lower neck)

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52
Q

WHat lies alongside the internal jugular vein?

A

Deep cervical lymph nodes

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53
Q

Internal jugular vein upper and lower ends

A

They are dilated, superior and inferior bulbs

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54
Q

Tributaries of the internal jugular vein

A
  • inferior petrosal sinus and sigmoid sinus, leaves cranial cavity via jugular foramen and drains into superior bulb
  • lingual vein(s)
  • pharyngeal veins
  • facial vein
  • superior and middle thyroid veins
  • occipital vein (sometimes)
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55
Q

Where does the right subclavian artery being?

A

It is a branch of brachiocephalic trunk (artery), begins posterior to right sternoclavicular joint

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56
Q

Where does the left subclavian artery start?

A

Its a branch of the aortic arch, begins in the superior mediastinum

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57
Q

What is the subclavian artery divided into?

A

3 parts by the scalenus anterior muscle

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58
Q

1st part of subclavian artery

A

From origin to medial border of scalenus anterior

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59
Q

2nd part of the subclavian artery

A

Posterior to scalneus anterior

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60
Q

3rd part of the subclavian artery

A

From lateral border of scalenus anterior to lateral border of 1st rib, where it becomes continuous with axillary artery

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61
Q

What are the branches of the 1st part of the subclavian artery?

A
  • vertebral artery
  • thyrocervical trunk
  • internal thoracic artery
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62
Q

Branches of the second part of the subclavian artery

A

Costocervical trunk (may originate from the 1st part

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63
Q

Branches of the 3rd part of the subclavian artery

A

Gives rise to dorsal subscapular artery or may have no branches
-if its there it runs through the brachial plexus

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64
Q

Where does the vertebral artery originate from?

A

1at part of subclavian artery

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65
Q

What are the parts of the vertebral artery?

A
  • 1st (prevertebral) part
  • 2nd (cervical) part
  • 3rd (atlantic) part
  • 4th (intracranial) part
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66
Q

1st (prevertebral) part of the vertebral artery

A
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67
Q

What lies posterior to the 1st (prevertebral) part of the vertebral artery?

A

Inferior cervical sympathetic ganglion

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68
Q

2nd part (cervical) of the vertebral artery

A

Ascends through transverse foramina of C6 to C1, anterior to ventral rami of corresponding spinal nerves

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69
Q

3rd part (atlantic) part of the vertebral artery

A
  • runs medically, posterior to lateral mass of atlas, and enters vertebral canal passing under posterior Atlanto-occipital membrane
  • it lies in a groove on superior surface of posterior arch of atlas and it is within the suboccipital triangle
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70
Q

What triangle is the 3rd (atlantic) part of the vertebral located within?

A

Suboccipital triangle

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71
Q

4th (intracranial) part of the vertebral artery

A

Pierces dura mater and arachnoid and ascend into cranial cavort (within subarachnoid space) via foramen magnum

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72
Q

Where do the major branches of the vertebral artery come off of?

A

The 4th part (intracranial)

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73
Q

What part of the vertebral artery gives off small muscular and spinal branches?

A

2nd part (cervical)

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74
Q

Where does the thyrocervical trunk originate from?

A

1st part of subclavian artery, just medial to scalenus anterior muscle and opposite origin of internal thoracic artery

75
Q

When does the thyrocervical trunk divide and into what?

A

After a short course, it divides into inferior thyroid, superficial (transvers) cervical, and suprascapular arteries

76
Q

What are the branches of the thyrocervical trunk?

A
  • inferior thyroid artery
  • superficial (transverse) cervical artery
  • suprascapular artery
77
Q

What does the inferior thyroid artery contribute to?

A

To supply

  • larynx
  • trachea
  • pharynx
  • esophagus
  • thyroid
  • parathyroid
78
Q

What does the inferior thyroid artery originate from?

A

Thyrocervical trunk

79
Q

Route of the inferior thyroid artery

A

Ascends to level of cricoid cartilage and then arches medically, posterior to carotid sheath, to reach lower part of lobe of thyroid gland

80
Q

Inferior thyroid artery as it approaches the thyroid gland

A

It is closely related to recurrent laryngeal nerve

81
Q

Ascending cervical artery

A
  • originates from inferior thyroid artery as it arches medically
  • ascends on scalenus anterior muscle
  • supplies adjacent muscles and gives 1 or 2 spinal branches
82
Q

Where does the superficial (transverse) cervical artery originate from?

A

Thyrocervical trunk

83
Q

What is the route of the superficial (transverse) artery?

A

Runs laterally and posteriorly, passing anterior to scalenus anterior, phrenic nerve, and brachial plexus

84
Q

What does the superficial (transverse) cervical artery supply?

A

Muscle of upper back

85
Q

When is the superficial (transverse( artery referred to as “superficial cervical?”

A

If dorsal subscapular artery originates directly from subclavian artery

86
Q

When is the superficial (transverse) cervical artery known as “transverse cervical artery?”

A

When it gives off the dorsal scapular artery

87
Q

Suprascapular artery originates from where?

A

Thyrocervical trunk

88
Q

How does the suprascapular artery run?

A

Parallel and inferior to superficial (transverse) cervical artery

89
Q

WHat nerve joins the suprascapular artery as it approaches the scapula?

A

Suprascapular artery

90
Q

What does the suprascapular artery supply?

A

Muscles on posterior aspect of scapula

91
Q

Where does the costocervical trunk originate from?

A

Usually the 2nd part of subclavian artery

92
Q

How does the costocervical trunk run?

A

Passes posteriorly, over cervical pleura, toward neck of 1st rib, where it divides into supreme (superior) intercostal and deep cervical arteries

93
Q

Supreme (superior) intercoastal atery

A
  • from costocervical trunk
  • descends in front of neck and 1st and 2nd ribs
  • gives off posterior intercostal arteries of upper 2 intercostal spaces
94
Q

Deep cervical artery

A
  • comes from costocervical trunk
  • passes, posteriorly, between transverse processes of C7 and neck of 1st rib, ascends between semispinalis capitis and emispinalis cervicis muscles, then ends by anastomising with a branch of occipital artery
95
Q

What does the deep cervical artery supply?

A

Deep muscles of the back of the neck

96
Q

Where does dorsal scapular artery originate from?

A

May originate from transverse cervical artery or directly from subclavian artery (usually 3rd part)

97
Q

How does the dorsal scapular artery run?

A
  • runs through brachial plexus
  • passes deep to levator scapulae to reach superior angle of scapula
  • descends along medial border of scapula, deep to rhomboid muscles, with dorsal scapular nerve
98
Q

What does the dorsal scapular artery supply?

A

Neighboring muscles and anastomoses with branches of suprascapular artery (branch of thyrocervical trunk) and subscapular artery (branch of axillary artery)

99
Q

Where does the subclavian vein originate from?

A

Begins at lateral border of 1st rib, as a continuation of axillary vein

100
Q

How does the subclavian vein run?

A

Passes over 1st rib, anterior and slightly inferior to subclavian artery (separated from it by scalenus anterior muscle)

101
Q

Where does the subclavian vein end?

A

Ends posterior to sternoclavicular joint by joining internal jugular vein to form brachiocephalic vein

102
Q

What is the only constant tributary of the subclavian vein?

A

External jugular vein

103
Q

What kind of fibers do the Vagus Nerve contain?

A

Motor and sensory fibers

-also parasympathetic

104
Q

What is the route of the vagus nerve?

A

Descends in neck within carotid sheath, first between internal jugular vein and internal carotid artery, and more inferiorly between internal jugular vein and common carotid artery

105
Q

What are the two sensory ganglion that the vagus nerve contain?

A
  • superior ganglion

- inferior ganglion

106
Q

Superior ganglion

A
  • sensory ganglion on the vagus nerve

- small, lies on vagus nerve within jugular foramen

107
Q

Inferior ganglion

A
  • sensory ganglion on vagus nerve

- larger, lies on vagus nerve just inferior to jugular foramen

108
Q

Vagus nerve branches within jugular foramen

A
  • meningeal branch

- auricular branch

109
Q

Meningeal branch of vagus nerve

A
  • within jugular foramen

- supplies dura mater of posterior cranial fossa

110
Q

Auricular branch of the vagus nerve

A
  • within jugular foramen

- runs within temporal bone and contributes to supply auricle, external acoustic meatus, and tympanic membrane

111
Q

Vagus nerve branches of the neck

A
  • pharyngeal branch
  • superficial laryngeal nerve
  • cardiac branches
  • right recurrent laryngeal nerve
112
Q

Pharyngeal branch of vagus nerve

A
  • in neck
  • supplies motor innervation to most muscles of pharynx and soft palate
  • joins pharyngeal branches of glossopharyngeal nerve and superior cervical ganglion of sympathetic trunk to form pharyngeal plexus
113
Q

Superior laryngeal nerve

A
  • neck branch of vagus nerve

- divides into internal and external laryngeal nerves

114
Q

Internal laryngeal nerve

A
  • branch of superior laryngeal nerve, which is a neck branch of vagus nerve
  • sensory
  • pierces thyrohyoid membrane with superior laryngeal vessels
  • supplies sensory innervation to mucosa of laryngopharynx, larynx, and small area on posterior part of tongue
115
Q

External laryngeal nerve

A
  • branch of superior laryngeal nerve which is a neck branch of the vagus nerve
  • motor
  • supples cricothyroid muscle, and part of inferior pharyngeal constrictor muscle
116
Q

Cardiac branch of vagus nerve

A
  • branch in neck
  • end in cardiac plexus in thorax
  • comes off up high
117
Q

Right recurrent laryngeal nerve

A
  • branch of vagus nerve in neck
  • curves around inferior aspect of right subclavian artery, close to its origin
  • ascends to larynx in groove between trachea and esophagus, on right side
118
Q

What kind of fibers does the accessory nerve have?

A

Motor fibers, spinal root

119
Q

Where does accessory nerve originate?

A

C1 to C5 segment of spinal cord

120
Q

How does the accessory nerve ascend?

A

Ascends in vertebral canal, posterior to denticulate ligament

121
Q

How does the accessory nerve enter cranial fossa

A

Through foramen magnum

122
Q

What happens after accessory nerve enters the cranial fossa

A

After a short course, it exits posterior cranial fossa through jugular foramen, descends obliquely, lateral or medial, to internal jugular vein

123
Q

WHat does the accessory nerve supply?

A

Enters deep surface of sternocleidomastoid and supplies it

124
Q

What is the course of the accessory nerve after it enters the sternocleidomastoid muscle?

A

Emerges above midpoint of posterior border of sternocleidomastoid, crosses posterior triangle of neck (on levator scapulae) and disappears under anterior border of trapezius to supply it

125
Q

What kind of fibers does hypoglosssal nerve have?

A

Motor fibers that supply the tongue

126
Q

Where does the hypoglossal nerve originate?

A

From medulla oblong at a and exits skull via the hypoglossal canal

127
Q

What is the course of the hypoglossal nerve?

A
  • descends between internal carotid artery and internal jugular vein to approximately level of angle of mandible
  • curves around accipital artery and turns forward
  • passes superficial to external carotid artery, origin of lingual arter, and hypoglossus muscle, and it passes deep to posterior belly of digastric, stylohyoid, and mylohyoid muscles
128
Q

What is the hypoglossal nerve joined by?

A

Opposite atlas, it is joined by fibers from ventral rami of C1 and C2 spinal nerves

129
Q

What supplies the motor innervation to infrahyoid muscles and geniohyoid, and sensory innervation to dura mater of posterior cranial fossa?

A

Hypoglossal nerves joined by fibers from ventral rami of C1 and C2 spinal nerves

130
Q

What are the branches of the hypoglossal nerve branches?

A
  • meningeal branch
  • upper root of ansa cervicalis
  • nerves to thyroid and geniohyloid
  • terminal branches
131
Q

Meningeal branch of hypoglossal nerve

A
  • not a “true” branch
  • arises from hypoglossal nerve within hypoglossal canal
  • supplies dura mater of posterior cranial fossa
  • contains sensory fibers from C1 and C2 spinal nerves
132
Q

Upper root of ansa cervicalis

A
  • not a true branch of hypoglossal nerve

- consists of C1 motor fibers

133
Q

Nerves to thyroid and geniohyoid

A
  • not true branches of hypoglossal nerve

- consist of C1 motor fibers

134
Q

Terminal branches of hypoglossal nerve

A
  • only branches that contain true hypoglossal fibers

- supply intrinsic and extrinsic muscles of tongue

135
Q

What is the upward continuation of the thoracic trunk?

A

Cervical part of the sympathetic trunk

136
Q

How does the cervical part of the sympathetic trunk lie?

A

Posterior to carotid sheath and anterior or prevertebral muscles

137
Q

Fibers of cervical part of the sympathetic trunk

A
  • receives no white communicating rami (above T1-L2)
  • preganglionic fibers for cervical symp ganglio orginiate from upper thoracic segments of spinal cord
  • leave spinal cord at T1 to T4 spinal nerves
  • enter upper thoracic symp trunk to reach cervical ganglia
138
Q

What interconnected ganglia do the cervical part of symp trunk consist of?

A
  • superior, middle, and inferior cervical ganglia

- sometimes a 4th (vertebral) ganglion is present on anterior aspect of vertebral artery, close to its origin

139
Q

All branches that originate from the interconnected ganglia of the cervical part of the symp trunk contain what?

A

Postganglionic sympathetic fibers

No splanchnic

140
Q

What is the largest cervical ganglion?

A

Superior cervical ganglion

141
Q

Branches of the superior services ganglion

A
  • internal carotid nerve
  • external carotid nerves
  • gray communicating rami to spinal nerves C1 to C4
  • pharyngeal branches
  • superior cervical cardiac nerve
142
Q

Internal carotid nerve

A
  • branch of the superior cervical ganglion
  • upward continuation of superior cervical ganglion
  • divides into branches that form the plexus around internal carotid artery and its branches
143
Q

External carotid nerves

A
  • branch of superior cervical ganglion
  • join external carotid artery
  • form plexus around external carotid artery and its branches
144
Q

Pharyngeal branches (nerves)

A
  • branches of superior cervical ganglion

- join pharyngeal branches of glosspharyngeal and vagus nerves to form pharyngeal plexus

145
Q

Superior cervical cardiac nerve

A
  • branch od superior cervical ganglion

- ends in cardiac plexus

146
Q

What is the smallest and most variable of cervical ganglia?

A

Middle cervical ganglion

147
Q

Where does the middle cervical ganglion lie?

A

Commonly lie at level of cricoid cartilage, close to arch of inferior thyroid artery

148
Q

Branches of the middle cervical ganglion

A
  • gray communicating rami for spinal nerves C5 and C6
  • middle cervical cardiac plexus (ends in cardiac plexus)
  • thyroid branches (follow inferior thyroid artery to thyroid gland)
149
Q

What does the inferior cervical ganglion commonly fuse with?

A

The first thoracic ganglion to form cervicalthoracis (Stella the) ganglion

150
Q

Where does the inferior cervical ganglion lie?

A

Between transverse process of C7 vertebra and neck of 1st rib, posterior to 1st part of vertebral artery

151
Q

Branches of the inferior cervical ganglion

A
  • gray communicating rami to spinal nerves C7 an C8
  • branches that accompany vertebral and subclavian arerteis
  • inferior cervical cardiac nerve (ends in cardiac plexus)
  • ansa subclavia
152
Q

Ansa subclavian

A
  • branch of inferior cervical ganglion

- thin nerve bundle connecting middle and inferior cervical ganglia that loops around subclavian artery

153
Q

What is the cervical plexus formed by?

A

Ventral rami of C1 to C4 spinal nerves

154
Q

How are C1 to C4 ventral rami connected?

A

By nerve loops located anterior to origin as of levator scapulae and scalenus medius, and deep to sternocleidomastoid

155
Q

Branches of the cervical plexus

A
  • cutaneous branches: lesser occipital, great auricular, transverse cervical, and supraclavicular nerves
  • ansa cervicalis
  • phrenic nerve (C3 to C5)
  • muscular branches
156
Q

Phrenic nerve (C3 to C5)

A
  • branch of cervical plexus
  • descends anterior to scalenus anterior muscle
  • at root of neck passes anterior to 1st part of subclavian artery
  • descends through superior and middle parts of mediastinum to reach diaphragm
157
Q

Muscular branches of cervical plexus

A

-supply anterior vertebral muscles, scalenus medius, levator scapulae, trapezius (proprioceptive), and sternocleidomastoid (proprioceptive)

158
Q

Thyroid gland

A

Endocrine gland

  • secretes thyroxine (T4) and triiodothyronine (T3), which stimulate metabolic rate
  • secretes calcitonin, which lowers blood calcium levels
159
Q

Where does the thyroid gland originate from?

A

The endoderm of floor of pharynx ( in region where tongue develops)

160
Q

Development of thyroid gland

A
  • migrates inferiorly to assume its final position in neck
  • its point of origin is indicated on dorsal surface of tongue by foramen cecum
  • during its migration, thyroid gland remains connected to tongue by narrow canal, thyrogloassal duct (later disappears)
161
Q

Thyroglossal cysts

A
  • cysts caused by persistence of a segment of thyroglossal duct
  • located in anterior midline of neck, usually close to hyoid bone
162
Q

What are the lobes of the thyroid?

A
  • two lobes (right and left)
  • isthmus
  • pyramidal lobe (not always present)
163
Q

Thyroid lobes

A
  • roughly pear shaped
  • apex directed upward (reaches oblique line of thyroid cartilage)
  • base directed downward (reaches 4th or 5th tracheal cartilages)
164
Q

Isthmus of thyroid gland

A

Extends across midline anterior to 2nd and 3rd tracheal cartilages

165
Q

Pyramidal lobe of thyroid

A
  • projects upward from isthmus (not always there)

- represents distal part of thyroglossal duct that does not disappear

166
Q

Anterolateral relation of thyroid lobes

A

Sternothyroid (covers gland directly), sternohyoid, anterior border of sternocleidomastoid

167
Q

Posterolateral relation of the thyroid lobes

A

Carotid sheath with its contents

168
Q

Medial relation of the thyroid lobes

A

Larynx, trachea, pharynx, esophagus, external laryngeal nerve, recurrent laryngeal nerve

169
Q

Posterior relation to the thyroid lobes

A

Parathyroid glands

170
Q

Anterior relation to isthmus

A

Sternothyroid, sternohyoid, anterior jugular vein (strap muscles)

171
Q

Posterior relation to the isthmus

A

2nd and 3rd tracheal cartilages

172
Q

Arteries of the thyroid gland

A
  • superior thyroid artery (1st anterior branch od external carotid artery)
  • inferior thyroid artery (branch of thyrocervical trunk [from 1st part of subclavian artery])
  • thyroid ima (lowest) artery
173
Q

Thyroid (lowest) ima artery

A
  • present in 10% of people
  • usually originates from brachiocephalic trunk or aortic arch
  • ascends on anterior surface of trachea to reach isthmus of thyroid gland
  • possible present of this artery must be considered when performing procedures in midline of neck, inferior to isthmus
174
Q

Veins of the thyroid gland

A
  • superior and middle thyroid veins

- inferior thyroid vein

175
Q

Superior and middle thyroid veins

A

Drain into internal jugular vein

176
Q

Inferior thyroid vein

A
  • descends anterior to trachea and posterior to manubrium if sternum
  • drains into corresponding brachiocephalic vein (sometimes right and left inferior thyroid veins join to form a single trunk, which drains into left brachiocephalic vein)
177
Q

Number of parathyroid glands

A

-usually 4 in number (two superior and two inferior)

178
Q

What are the parathyroid glands?

A

Flattened, oval bodies located on posterior aspect of lobes of thyroid gland, under its fascia sheath

179
Q

Superior parathyroid glands

A

Lie approximately at level of lower border of cricoid cartilage (pretty consistent)

180
Q

Inferior parathyroid glands

A

Lie near inferior pole of lobes of thyroid gland

  • less consistent in position
  • sometimes found below level of thyroid gland, even in superior mediastinum, close to thymus
181
Q

What does the parathyroidgland secrete

A

Parathormone

-increases blood calcium levels

182
Q

Removal of parathyroid gland

A

Cannot remove all 4 or calcium levels will go crazy

183
Q

Arterial supply to parathyroid gland

A

Superior and inferior thyroid arteries

184
Q

Veins of parathyroid gland

A

Parathyroid veins drain into thyroid venous plexus

Anatomy BLOCK 3 (13 decks)

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