Neck Flashcards
What are the 4 deep cervical fascia?
- Investing deep fascial layer
- Pretracheal fascia
- Carotid Sheath
- Prevertebral Layer
What is contained in the superficial cervical fascia?
Platysma
What is contained in the Investing deep fascial layer?
- SCM
2. Trapezius
What is contained in the pretracheal fascai?
- Thyroid gland
- Parathyroid gland
- Trachea
- Esophagus
What is contained in the Carotid Sheath?
- Lateral - Internal Jugular Vein
- Medial - Common Carotid and Internal Carotid Artery
- Posterior - Vagus Nerve
*Deep Cervical Lymph Nodes
This forms the fascial floor of the posterior triangle?
Prevertebral Layer
It is a potential space bounded by deep cervical fascia
Retropharyngeal Space
Only bone that does not articulate with another bone
hyoid bone
Level of hyoid bone at cervical vertebra
C3
What are the Suprahyoid Muscles
- Mylohyoid
- Geniohyoid
- Digastric
- Stylohyoid
What are the Infrahyoid Muscles
Superficial 1. Sternothyroid 2. Omohyoid Deep 1. Thyrohyoid 2. Sternothyroid
what is the function of suprahyoid muscle
elevates the hyoid bone
Nerve supply of ant. belly of digastric
Nerve to mylohyoid V3
Nerve supply of post. belly of digastric
facial
Nerve supply to stylohyoid
facial
Nerve supply to mylohyoid
nerve to mylohyoid V3
Nerve supply to geniohyoid
first cervical nerve
Nerve supply to omohyoid
Ansa cervicalis C1, C2, C3
Nerve supply to sternohyoid
Ansa cervicalis C1, C2, C3
Nerve supply to sternothyroid
Ansa cervicalis C1, C2, C3
nerve supply to thyrohyoid
C1
Depresses the hyoid
- omohyoid
- sternohyoid
- thyrohyoid
Depress the larynx
- sternothyroid
Elevate the larynx
- thyrohyoid
Composition of the anterior triangle of the neck
- submental
- submandibular
- carotid
- muscular
Composition of the posterior triangle of the neck
- occipital
2. supraclavicular
what is the unpaired triangle of the neck
submental triangle
Boundary of Submental Triangle
- anterior belly of digastric
- hyoid bone
- mylohyoid (floor)
Boundary of Submandibular Triangle
- anterior belly of digastric
- posterior belly of digastric
- mandible
Boundary of Carotid Triangle
- antior SCM
- Superior belly of omohyoid
- posterior belly of digastric
Bounday of Muscular Triangle
- ant midline of neck
- anterior SCM
- Superior belly of omohyoid
Boundary of occipital triangle
- posterior SCM
- Trapezius
- inferior belly of omohyoid
Boundary of supraclavicular triangle
- clavicle
- inferior belly of omohyoid
- post SCM
Contents of muscular triangle
- sternohyoid, sternothyroid, thyrohyoid
2. thyroid, parathyroid, larynx
Contents of the Posterior Triangle
5 muscles 1. scalene anterior 2. scalene middle 3. levator scapular 4. splenius 5. omohyoid 4 arteries 1. Subclavian artery 2. transverse cervical artery 3. suprascapular artery 4. occipital artery 3 nerves 1. Accesory Nerve 2. Brachial Plexus 3. Cervical Plexus 2 veins 1. subclavian vein 2. external jugular vein
Blood Supply of Thyroid Artery
- Superior Thyroid Artery - ECA
2. Inferior Thyroid Artery - Thyrocervical Trunk
Venous Drainage of Thyroid Artery
- Superior Thyroid Vein - IJV
- Middle Thyroid Vein - IJV
- Inferior Thyroid Vein - Brachiocephalic
Where does the pyramidal lobe usually project?
Left o the midline
Perentage of people with thyroidea Ima Artery
12%
This is the first endocrine gland to develop?
Thyroid Gland
When does the thyroid gland develop?
24 days after fertilization
Most common site of ectopic thyroid gland
Lingual
Primary Tumors within the oral cavitiy and lip metastasize to what lymph node
I, II, III
Primary Tumors within the oropharynx, hypopharynx and larynx metastasize to what lymph node
II, III, IV
Primary Tumors within the nasopharynx and thyroid metastasize to what lymph node
V
What cervical vertebra does pharynx becomes continuous with esophagus
C6
What is the shape of the pharynx
Funnel shaped
3 parts of the pharynx
- nasopharynx
- oropharynx
- laryngopharynx
Content of nasopharynx
- opening of auditory tube
2. pharyngeal tonsils
Innervation of nasopharynx
Maxillary Nerve (V2)
Contents of oropharynx
- palatine tonsil
2. lingual tonsil
Innervation of oropharynx
Glosopharyngeal Nerve
Content of laryngopharynx
- opens into larynx and esophagus
Innervation of laryngopharynx
- Internal Laryngeal Nerve
2. Vagus Nerve
Blood Supply of Pharynx
- ascending pharyngeal
- Tonsillar branches of facial
- Branches of maxillary and lingual arteries
What are the outer circular layer muscles of the pharynx
- inferior constrictor muscle
a. cricopharyngeus
b. thyropharyngeus - middle constrictor muscle
- superior constrictor muscle
What is the purpose of outer circular layer muscle of the pharynx?
Porpel bolus downwards
What are the inner longitudinal layer muscles of the pharynx
- stylopharyngeus
- salhpingopharyngeus
- palatopharyngeus
What is the function of the inner longitudinal layer muscles of the pharynx
Shorten and widen the pharynx
Outpouching of the laryngopharynx
Zenker Diverticulum
What is the lymph drainage of the pharynx
Deep cervical Lymph Nodes
What nerve can be possibly damaged during a tonsillectomy
Glossopharyngeal nerve
Composition of the waldeyer’s ring
upper: pharyngeal tonsil/adenoids
lateral: palatine and tubal tonsils
lower: lingual tonsil
afferent limb of the gag reflex
Pharyngeal branch of the glossopharyngeal nerve
efferent limb of the gag reflex
pharyngeal branch of the vagus nerve
Where does the larynx lie?
C4 - C6
Unpaired laryngeal cartilages
- thyroid
- cricoid
- epiglottis
Paired laryngeal cartilage
- arytenoid
- cuneiform
- corniculate
How many cartilage does the larynx have
9
Membranes/Ligaments of the Larynx
- thyrohyoid membrane
- cricotracheal ligament
- quadrangualar membrane
- cricothyroid ligament
Cricoid Cartilage is what cervical area
C6
It is located inferior to the thyroid cartilage and superior to the cricoid cartilage. True vocal cords lie superior to it
Cricothyroid Ligament/Membrane
Vestibular Fold
- fixed
- formed by mucous membrane covering the VESTIBULAR ligament
- vascular: pink in color
Vocal fold
- movable
- formed by mucous membrane covering the VOCAL ligament
- avascular: white in color
What nerve maybe injured during ligation of the superior thyroid artery
External laryngeal nerve
Blood supply of larynx
- upper - superior laryngeal branch of superior thyroid artery
- lower - lower laryngeal branch of inferior thyroid artery
Lymph drainage of larynx
Deep cervical lymph nodes
Sensory innervation above the vocal cord area
Internal Laryngeal Nerve of the Superior Larnygeal nerve of the vagus nerve
Nerve supply to the cricothyroid
External Laryngeal Nerve of the Superior Laryngeal nerve of the vagus nerve
Motor Nerve supply to muscles of phonation except cricothyroid
Sensory below the vocal cord area
Inferior laryngeal nerve/recurrent laryngeal nerve of the vagus nerve
Action of Cricothyroid
Tensor
Action of Posterior Cricoarytenoid
Abductor (PAB)
Action of Lateral Cricoarytenoid
Adductor (LAD)
Action of Thyroarytenoid
Relaxor
What is the innervation of posterior, lateral cricoarytenoid and thyroarytenoid
Inferior/Recurrent Laryngeal Nerve
What is the innvervation of cricothyroid
External Laryngeal Nerve
What muscle allow air movement through the larynx
Lateral cricoarytenoid
Superior laryngeal nerve lesion
- asyptomatic
- fibers are mainly sensory
- if external branch - mild hoarseness/monotonous speech
Inferir laryngeal/ Recurrent laryngeal nerve
- fix vocal cord and transient hoarseness
Which recurrent laryngeal nerve is injured more commonly
- LEFT - because it hooks around arch of aorta
2. right - hooks around right subclavian artery
Blood supply of parathyroid gland
- superior thyroid artery
2. inferior thyroid artery
Venous supply of parathyroid gland
- supple thyroid vein
- middle thyroid vein
- inferior thyroid vein
Lymph drainage of parathyroid gland
- deep cervical
2. paratracheal
What are the cells produced by the parathyroid gland
- chief cells - PTH
2. oxyphil cells
What are the cells produced by the thyroid horone
- follicular cells - T3, T4
2. Parafollicular cells - calcitonin
Development of the inferior parathyroid gland
3rd pharyngeal pouch
Development of the superior parathyroid gland
4th pharyngeal pouch
Development of ectopic parathyroid gland
seen in the superior mediastinum
close relationship between inferior paratyhroid and thymus
Muscles innvervated by ansa cervicalis
- Sternohyoid
- Omohyoid
- Sternothyroid
S.O.S
Cutaneous Branches of Cervical Plexus
- Lesser occipital (C2)
- Greater auricular (C2 and C3)
- Transverse cutaneous (C2 and C3)
- Supraclavicular (C3 and C4)
Muscular Branches of Cervical Plexus
- Ansa Cervicalis (C1, C2, C3)
2. Phrenic Nerve (C3, C4, C5)
Where does phrenic nerve pass
- Posterior - subclavian vein
- Anterior - sublavian artery
- Lateral - common carotid artery
What are the zones of penetrating neck trauma
Zone 1, 2 ,3
It pertains to a neck trauma that includes the root of the neck and extends from the clavicles and manubrium to the level of inferior border of the cricoid cartilage
Zone 1
It pertains to a neck trauma that extends fro the cricoid cartilage to the level of the angle of mandible
Zone 2
It pertains to a neck trauma above the level of the angle of the mandible
Zone 3
These injures to the neck obstruct the airway
Zone 1 and 3
Most common zone injured in the neck
Zone 2 - vascular damage may be controlled by direct pressure