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

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

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

sternohyoid

O: manubrium and P surface of SC joint
I: body of hyoid bone
Inn: ansa cervicalis of C plexus (C1-C3)
A: depresses (fixes) hyoid; draws larynx and hyoid down for phonation and terminal phases of swallowing

2

sternothyroid

O: P surface of manubrium
I: oblique line of thyroid cartilage
Inn: ansa cervicalis (C2-C3)
A: depresses (fixes) hyoid; draws larynx and hyoid down for phonation and terminal phases of swallowing

3

thyrohyoid

O: oblique line of thyroid cartilage
I: body of hyoid bone
Inn: C1 via hypoglossal n. (CN XII)
A: depresses and fixes hyoid; raises larynx during swallowing

4

omohyoid

O: S border of scapula
I: body of hyoid bone
Inn: ansa cervicalis of C plexus (C1-C3)
A: depresses (fixes) hyoid; draws larynx and hyoid down for phonation and terminal phases of swallowing; tenses C fascia w/ an intermediate tendon

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