sternomastoid

Question 1

sternomastoid sternal head origin

Answer 1

anterior surface of manubrium

Question 2

sternomastoid clavicular head origin

Answer 2

upper surface medial 1/3 of clavicle

Question 3

sternomastoid insertion

Answer 3

mastoid process & lateral 1/3 superior nuchal line

Question 4

sternomastoid direction of fibres

Answer 4

superiorly

Question 5

sternomastoid nerve supply

Answer 5

cranial accessory XI, anterior primary rami C2, 3

Question 6

sternomastoid action

Answer 6

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