Unit 4 - Head and Neck: Superficial Neck Muscles (Ex. III) Flashcards Preview

Gross Anatomy '15 Ex. III > Unit 4 - Head and Neck: Superficial Neck Muscles (Ex. III) > Flashcards

Flashcards in Unit 4 - Head and Neck: Superficial Neck Muscles (Ex. III) Deck (4)
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1

sternal head of sternocleidomastoid

O: manubrium of sternum
I: mastoid process of T bone; S nuchal line of O bone
Inn: accessory n. (CN XI); C plexus (C2, C3)
A: ipsilaterally laterally flexes head and contralaterally rotates; bilaterally extends head and aids in respiration w/ head fixed

2

clavicular head of sterncleidomastoid

O: M 1/3 of clavicle
I: mastoid process of T bone; S nuchal line of O bone
Inn: accessory n. (CN XI); C plexus (C2, C3)
A: ipsilaterally laterally flexes head and contralaterally rotates; bilaterally extends head and aids in respiration w/ head fixed

3

descending trapezius

O: EOP; nuchal ligament
I: L 1/3 of clavicle
Inn: accessory n. (CN XI); C plexus (C2, C3)
A: L rotates scapula; rotates glenoid cavity S

4

platysma

O: skin over lower neck and upper L thorax
I: I border of mandible; skin over lower face and angle of mouth
Inn: C branch of facial n. (CN VII)
A: depresses and wrinkles skin of lower face and mouth; tenses skin of neck; forced depression of mandible

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