⭐️Sternocleidomastoid (SCM)

Question 1

Origin

Answer 1

Medial 1/3 of clavicle
Manubrium of sternum

Question 2

Insertion

Answer 2

Mastoid process of temporal bone
Lateral 1/2 of the superior nuchal line of occipital bone

Question 3

Function

Answer 3

Ext of head at alanto-occipital joint
Flex of neck at spinal joints
Lat flex of head at alanto-occipital joint
Lat flex of neck at spinal joints
Contralateral rot of head at alanto-occipital joint
Contralateral rot of neck at spinal joints
Elevation of sternum at clavicle

Question 4

Nerve

Answer 4

C.N XI (spinal accessory nerve)