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Flashcards in sternomastoid Deck (6)
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1

sternomastoid sternal head origin

anterior surface of manubrium

2

sternomastoid clavicular head origin

upper surface medial 1/3 of clavicle

3

sternomastoid insertion

mastoid process & lateral 1/3 superior nuchal line

4

sternomastoid direction of fibres

superiorly

5

sternomastoid nerve supply

cranial accessory XI, anterior primary rami C2, 3

6

sternomastoid action

both together flex the neck, singly they laterally flex the neck to the same side and rotate to the opposite side