Sternocleidomastoid

Question 1

Action: Unilaterally

Answer 1

Laterally flex the head and neck to the same side, rotate the head and neck to the opposite side

Question 2

Action: Bilaterally

Answer 2

Flex the neck, assist to elevate the rib cage during inhalation

Question 3

Origin

Answer 3

Sternal head: Top of manubrium
Clavicular head: Medial 1/3 of the clavicle

Question 4

Insertion

Answer 4

Mastoid process of temporal bone and the lateral portion of superior nuchal line of occiput