Neck POINA's

Question 1

Sternocleidomastoid - Superomedial Attachment

Answer 1

mastoid process (temporal bone)
superior nuchal line

Question 2

Sternocleidomastoid - Inferolateral Attachment

Answer 2

sternal head - manubrium
clavicular head - medial 1/3 of clavicle

Question 3

Sternocleidomastoid - Muscle Action

Answer 3

bilaterally:
neck extension at OA joints
cervical vertebrae flexion
superior cervical vertebrae extension with inferior vertebrae flexion
with cervical vertebrae fixed, manubrium and medial clavicle elevation

unilaterally:
neck ipsilateral flexion
neck contralateral rotation

Question 4

Sternocleidomastoid - Nerve Innervation

Answer 4

spinal accessory nerve (CN XI)
ventral rami for pain and proprioception (C3, C4)