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Anatomy > Muscles for Exam 2 > Flashcards

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
Q

What is the action of the stylohyoid muscle?

A

Elevate larynx as a whole

26
Q

What supplies blood to the stylohyoid muscle?

A

Ascending pharyngeal a.

27
Q

Where is the origin of the mylohyoid muscle?

A

Mylohyoid line of mandible

28
Q

Where is the insertion of the mylohyoid muscle?

A

i) Hyoid bone
ii) Median raphe

29
Q

What is the action of the mylohyoid muscle?

A

Elevate larynx as a whole

30
Q

What is the innervation to the mylohyoid muscle?

A

CN5 (V3) – n. to mylohyoid m.

31
Q

What is the blood supply to the mylohyoid muscle?

A

Mylohyoid br. of inf. alveolar a.

32
Q

Where is the origin of the geniohyoid?

A

Inf. genial tubercle of mandible

33
Q

Where is the insertion of the geniohyoid?

A

hyoid bone

34
Q

What is the innervation to the geniohyoid muscle?

A

a) C1
b) C2

n.b. with CN12 (hypoglossal n.)

35
Q

What is the function of the geniohyoid muscle?

A

Elevate hyoid, tongue during swallowing

36
Q

What artery supplies the geniohyoid muscle?

A

Lingual a.

37
Q

Where does the masseter muscle originate?

A

Inf. and med. zygomatic arch

38
Q

What innervates the masseter?

A

CN5 (V3)

39
Q

What is the action of the masseter muscle?

A

1) Protrude mandible
2) Elevate mandible (close mouth)

40
Q

What is the origin of the temporalis muscle?

A

i) Temporal fossa
ii) Strong temporalis f.

41
Q

Where does the temporalis muscle insert?

A

Coronoid process and ant. ramus of mandible

42
Q

What is the innervation of the the temporalis muscle?

A

mandibular division of the trigeminal nerve

43
Q

What is the action of the temporalis miuscle?

A

1) Retract mandible
2) Elevate mandible (close mouth)

44
Q

What artery supplies the temporalis muscle?

A

deep temporal artery

45
Q

From where does the medial pterygoid originate?

A

i) Deep head = med. side of lat. pterygoid plate
ii) Superficial head = tuberosity of maxilla

46
Q

Where does the medial pterygoid insert?

A

Med. ramus and angle of mandible

47
Q

What innervates the medial pterygoid muscle?

A

mandibular division of the trigeminal nerve

48
Q

What is the action of the medial pterygoid muscle?

A

1) Protrude mandible
2) Elevate mandible (close mouth)
3) Assist lat. pterygoid for side to side movement

49
Q

From where does the lateral pterygoid originate?

A

i) Infratemporal side of greater wing of sphenoid bone
ii) Lat. side of lat. pterygoid plate of sphenoid

50
Q

Where does the lateral pterygoid insert?

A

i) Temporomandibular joint capsule
ii) Condylar process of mandible

51
Q

What is the action of the lateral pterygoid muscle?

A

1) Protrude mandible
2) Depress mandible (open mouth)
3) Side to side movement

52
Q

Where do the 4 rectus muscles of the eye originate from?

A

Common tendinous ring

53
Q

Where do the rectus muscles of the eye insert around?

A

corneal limbus

54
Q

What innervates the superior rectus and levator palpebrae superioris?

A

The superior division the oculomotor nerve

55
Q

What innervates the lateral rectus muscle?

A

The abducens nerve

56
Q

What is the action of the superior rectus muscle?

A

1) Elevate pupil
2) Adduct pupil

57
Q

What is the action of the inferior rectus muscle?

A

1) Depress pupil
2) Adduct pupil

58
Q

What is the function of the lateral rectus muscle?

A

Abduct pupil

59
Q

What is the function of the medial rectus muscle?

A

Adduct pupil

60
Q

What muscles are innervated by the inferior division of the oculomotor nerve?

A

the inferior rectus, inferior oblique muscle and them the medial rectus muscle

61
Q
A

Anatomy (16 decks)

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