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Muscles for Exam 2 Flashcards

1
Q

Give the origin and insertion of the sternohyoid muscle

A

origin: Behind manubrium of sternum
insertion: Hyoid bone

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2
Q

Give the innervation of the sternohyoid muscle

A

Ansa cervicalis (C1-3)

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3
Q

What is the action of the sternohyoid muscle?

A

Depress larynx as a whole

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4
Q

What blood vessels supply the sternohyoid muscle?

A

a) Inf. thyroid a.
b) Sup. thyroid a.

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5
Q

Give the origin and insertion of the sternothyroid muscle.

A

origin: Post. manubrium of sternum (below sternohyoid m.)
innsertion: Oblique line of thyroid cartilage

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6
Q

What is the innervation of the sternothyroid muscle?

A

Ansa Cervicalis (C1-3)

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7
Q

What is the action of the sternothyroid muscle?

A

Depresses Larnyx as a whole

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8
Q

What supplies the sternothyroid muscle?

A

superior and inferior thyroid arteries

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9
Q

Give the origin and insertion of the omohyoid muscle

A

origin: Upper border of scapula
insertion: Lower border of hyoid bone
n. b. Inf. and Sup. belly separated by tendon

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10
Q

Give the innervation to the omohyoid muscle.

A

Superior belly innervated by the superior root of the ansa cervicalis (descendens hypoglossi), inferior belly is innervated by the decendens cervicalis

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11
Q

What is the action of the omohyoid muscle?

A

1) Depress larynx, hyoid bone
2) Pull hyoid back, to side

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12
Q

What supplies the omohyoid muscle?

A

superior and inferior thyroid arteries

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13
Q

Where is the origin of the thyrohyoid muscle? Where does it insert?

A

Originates from the oblique line of thyroid cartilage, inserts on the hyoid bone

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14
Q

What innervates the thyrohyoid muscle?

A

innervated by ventral rami of C1 via hypoglossal nerve

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15
Q

What is the action of the thyrohyoid muscle?

A

1) Elevate larynx as a whole
2) Depress hyoid

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16
Q

What arteries supply the thyrohyoid muscle?

A

superior and inferior thyroid arteries

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17
Q

What is the origin of the digastric muscle?

A

Med. mastoid process of temporal bone = post. belly

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18
Q

Where is the insertion of the digastric muscle?

A

Inner mandible near midline = ant. belly

n.b. passes thru intermediate tendon pulley attached to hyoid

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19
Q

What innervates the diagastric muscle?

A

a) Ant. belly = CN5 (V3) – n. to mylohyoid m.
b) Post. belly = CN7 (facial n.)

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20
Q

What is the action of the diagastric muscle?

A

1) Elevate larynx as a whole
2) Open mouth (holding hyoid)

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21
Q

What supplies blood to the diagastric muscle?

A

a) Ant. belly = Facial a.
b) Post. belly = Occipital a.

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22
Q

Where is the origin of the stylohyoid muscle?

A

Styloid process of temporal bone

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23
Q

Where is the insertion of the hyoid bone?

A

Greater cornu of Hyoid bone

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24
Q

What is the innervation to the stylohyoid muscle?

A

CN7 (facial n.)

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25
What is the action of the stylohyoid muscle?
Elevate larynx as a whole
26
What supplies blood to the stylohyoid muscle?
Ascending pharyngeal a.
27
Where is the origin of the mylohyoid muscle?
Mylohyoid line of mandible
28
Where is the insertion of the mylohyoid muscle?
i) Hyoid bone ii) Median raphe
29
What is the action of the mylohyoid muscle?
Elevate larynx as a whole
30
What is the innervation to the mylohyoid muscle?
CN5 (V3) – n. to mylohyoid m.
31
What is the blood supply to the mylohyoid muscle?
Mylohyoid br. of inf. alveolar a.
32
Where is the origin of the geniohyoid?
Inf. genial tubercle of mandible
33
Where is the insertion of the geniohyoid?
hyoid bone
34
What is the innervation to the geniohyoid muscle?
a) C1 b) C2 ## Footnote n.b. with CN12 (hypoglossal n.)
35
What is the function of the geniohyoid muscle?
Elevate hyoid, tongue during swallowing
36
What artery supplies the geniohyoid muscle?
Lingual a.
37
Where does the masseter muscle originate?
Inf. and med. zygomatic arch
38
What innervates the masseter?
CN5 (V3)
39
What is the action of the masseter muscle?
1) Protrude mandible 2) Elevate mandible (close mouth)
40
What is the origin of the temporalis muscle?
i) Temporal fossa ii) Strong temporalis f.
41
Where does the temporalis muscle insert?
Coronoid process and ant. ramus of mandible
42
What is the innervation of the the temporalis muscle?
mandibular division of the trigeminal nerve
43
What is the action of the temporalis miuscle?
1) Retract mandible 2) Elevate mandible (close mouth)
44
What artery supplies the temporalis muscle?
deep temporal artery
45
From where does the medial pterygoid originate?
i) Deep head = med. side of lat. pterygoid plate ii) Superficial head = tuberosity of maxilla
46
Where does the medial pterygoid insert?
Med. ramus and angle of mandible
47
What innervates the medial pterygoid muscle?
mandibular division of the trigeminal nerve
48
What is the action of the medial pterygoid muscle?
1) Protrude mandible 2) Elevate mandible (close mouth) 3) Assist lat. pterygoid for side to side movement
49
From where does the lateral pterygoid originate?
i) Infratemporal side of greater wing of sphenoid bone ii) Lat. side of lat. pterygoid plate of sphenoid
50
Where does the lateral pterygoid insert?
i) Temporomandibular joint capsule ii) Condylar process of mandible
51
What is the action of the lateral pterygoid muscle?
1) Protrude mandible 2) Depress mandible (open mouth) 3) Side to side movement
52
Where do the 4 rectus muscles of the eye originate from?
Common tendinous ring
53
Where do the rectus muscles of the eye insert around?
corneal limbus
54
What innervates the superior rectus and levator palpebrae superioris?
The superior division the oculomotor nerve
55
What innervates the lateral rectus muscle?
The abducens nerve
56
What is the action of the superior rectus muscle?
1) Elevate pupil 2) Adduct pupil
57
What is the action of the inferior rectus muscle?
1) Depress pupil 2) Adduct pupil
58
What is the function of the lateral rectus muscle?
Abduct pupil
59
What is the function of the medial rectus muscle?
Adduct pupil
60
What muscles are innervated by the inferior division of the oculomotor nerve?
the inferior rectus, inferior oblique muscle and them the medial rectus muscle
61

Anatomy (16 decks)

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