Neck Muscles Flashcards

1
Q

Function of Platysma

A

Tenses skin of inferior face/neck

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2
Q

What nerve innervates the Platysma

A

Cranial Nerve VII - Facial Nerve

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3
Q

Function of Trapezius

A

Shoulder elevation/depression. Retracts scapula. Rotates glenoid to face superiorly (helps us reach up)

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4
Q

What innervates Trapezius

A

CN XI - Spinal Accessory

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5
Q

Fxn of Sternocleidomastoid

A

Unilateral contraction: lateral flexion and rotation of head (causes to face up and away from muscle);

Bilateral contraction: extends head at neck and flexes neck to bring chin down towards chest

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6
Q

What innervates Sternocleidomastoid

A

Spinal accessory nerve (CN XI)

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7
Q

Fxn of Geniohyoid

A

Pulls hyoid anteriorly, shortens floor of mouth, widens pharynx

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8
Q

Innervation of Geniohyoid

A

C1 ventral ramus via CN XII

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9
Q

Fxn of Stylohyoid

A

Elevates/retracts hyoid, elongates floor of mouth

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10
Q

Innervation of Stylohyoid

A

CN VII - Facial Nerve

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11
Q

Fxn of Diagastric: Anterior and Posterior Belly

A

Elevates hyoid during swallowing/speaking, can also depress mandible

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12
Q

Innervation of Diagastric: Anterior and Posterior Belly

A

Anterior: Inferior alveolar nerve

Posterior: CN VII - Facial Nerve

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13
Q

Fxn Mylohyoid

A

Elevates hyoid, tongue, floor of mouth during swallowing/speech

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14
Q

Innveration of Mylohyoid

A

Inferior alveolar nerve

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15
Q

Fxn Hyoglossus

A

Depresses tongue

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16
Q

Innervation Hyoglossus

A

CN XII - Hypoglossal Nerve

17
Q

Fxn Sternohyoid

A

Depresses hyoid after elevation from swallowing

18
Q

Innervation Sterohyoid

A

Ventral rami from C1-C3 via ansa cervicalis

19
Q

Fxn Omohyoid

A

Depresses/retracts hyoid

20
Q

Innervation Omohyoid

A

Ventral rami from C1-C3 via ansa cervicalis

21
Q

Fxn Sternothyroid

A

Depresses hyoid and larynx

22
Q

Innervation Sternothyroid

A

Ventral rami from C2-C3 via ansa cervicalis

23
Q

Fxn Thyrohyoid

A

Depresses hyoid, elevates larynx

24
Q

Innervation Thyrohyoid

A

Depresses hyoid, elevates larynx

25
Q

What muscles insert onto the Hyoid Bone?

A

Geniohyoid
Stylohyoid
Sternohyoid
Omohyoid
Thyrohyoid
Mylohyoid
Digastric - hooks under tendon to hyoid

26
Q

What muscles are innervated by Ventral rami from C1-C3 via ansa cervicalis

A

Sternohyoid
Omohyoid
Sternothyroid