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Anatomy LAB > Neck and Facial Muscles > Flashcards

Neck and Facial Muscles Flashcards

1
Q

Sternocleidomastoid

A

thick, cordlike muscle that extends from the sternum and clavicle ot the mastoid process posterior to the ear

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2
Q

What is the origin of the sternocleidomastoid?

A

manubrium of sternum, clavicle

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3
Q

What is the insertion of the sternocleidomastoid?

A

mastoid process

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4
Q

What is the action of the sternocleidomastoid?

A

singly, rotates head to opposite shoulder; together, flexes head

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5
Q

Sternohyoid

A

extends from the sternum to the hyoid, where it depresses the hyoid bone

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6
Q

What is the origin of the sternohyoid?

A

manubrium and clavicle

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7
Q

What is the insertion of the sternohyoid?

A

hyoid bone

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8
Q

What is the action of the sternohyoid?

A

depresses hyoid

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9
Q

Sternothyroid

A

located deep to the sternohyoid and extends from the sternum to the thyroid cartilage of the larynx

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10
Q

What is the origin of the sternothyroid?

A

manubrium

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11
Q

What is the insertion of the sternothryroid?

A

thyroid cartilage

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12
Q

What is the action of the sternothyroid?

A

depresses thyroid cartilage (of larynx)

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13
Q

Thyrohyoid

A

extends from the thyroid cartilage of hte larynx to the hyoid; closes off the larynx when swallowing

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14
Q

What is the origin of thyrohyoid?

A

thyroid cartilage

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15
Q

What is the insertion of thyrohyoid?

A

hyoid bone

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16
Q

What is the action of thyrohyoid?

A

depresses hyoid and elevates larynx

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17
Q

Mylohyoid

A

broad, flat muscle that proveds a musclular floor to the mouth; muscle fibers of the left and right are aligned in a V shape

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18
Q

What is the origin of mylohyoid?

A

mandible

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19
Q

What is the insertion of mylohyoid?

A

hyoid

20
Q

What is the action of mylohyoid?

A

elevates hyoid

21
Q

Digastric “two bellies”

A

two bellies. anterior and posterior; one belly extends from the mental protuberance of the hyoid, and the other continues from the hyoid to the mastoid portion of hte temporal bone

two bellies are united by an intermediate tendon that is held in position by a fascia sling (fibrous loop)

22
Q

What is the origin of the digastric?

A

mandible and mastoid process

23
Q

What is the insertion of the digastric?

A

by a connective tissue loop to hyoid bone

24
Q

What is the action of the digastric?

A

depresses mandible; elevates hyoid bone

25
Q

Epicranius (frontal belly)

A

composed of the occipitofrontalis muscle and a broad epicranial aponeurosis

frontal belly of occipitofrontalis is superficial to the frontal bone on the forehead; raises eyebrows and wrinkles the skin of forehead

26
Q

Epicanius (occipital belly)

A

covers the posterior side of the head; retracts the scalp slightly

27
Q

What is the action of the frontal belly of the epicranius?

A

raises eyebrows

28
Q

What is the action of the occipital belly of the epicranius?

A

retracts scalp

29
Q

Temporalis

A

broad, fan shaped muscle that extends from the temporal lines of the skull and attaches to the coronoid process of the mandible; elevates and retracts the mandible

30
Q

What is the action of the temporalis?

A

elevates and retracts mandible

31
Q

Masseter

A

short, thick muscle that is superficial to the temporalis; most powerful and important of the masticatory muscles

32
Q

What is the origin of the masseter?

A

zygomatic arch

33
Q

What is the insertion of the masseter?

A

cornoid process and ramus of mandible

34
Q

What is the action of the masseter?

A

prime mover of jaw closure; elevates and protracts mandible

35
Q

Orbicularis occuli

A

circular muscle fibers that surround the orbit; helps eyelid close

36
Q

What is the action of the orbicualris occuli?

A

closes eye

37
Q

Orbicularis oris

A

muiscle fibers that encircle the opening of the mouth; you close your mouth when muscle contracts

38
Q

What is the action of the orbicularis oris?

A

compresses and purses lip; kissing/whistling muscle

39
Q

Levator labii superioris

A

muscle that contributes in pulling the upper lip superiorly as if a person is sneering or snarling

40
Q

What is the action of the levator labii superioris?

A

raises upper lip

41
Q

Risorius

A

pulls corner of the lips laterally; you use this muscle if making a closed mouth smile

42
Q

What is the action of the risorius?

A

draws corner of lip laterally; synergist to zygomaticus

43
Q

Buccinator

A

muscle that compresses cheek against the teeth when we chew

44
Q

What is the action of the buccinator?

A

compresses cheek (for whistling and sucking)

45
Q

Zygomaticus (major and minor)

A

muscles that work with the levator anguli oris muscles; you use when you smile

46
Q

What is the action of the zygomaticus?

A

elevates corners of mouth, smiling muscle

47
Q
A

Anatomy LAB (28 decks)

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