Muscles producing movement of the neck/back

Sternocleidomastoid

O: Sternal head: Manubrium of sternum, Clavicular head: Medial 1/3 of the clavicle
I: Mastoid process of the temporal bone and superior nuchal line of occiput
M: Fusiform, 2 headed muscle
N: Spinal accessory nerve, C2-C3
Unilaterally: Lateral flex the head and neck to the same side, rotate the head and neck to the opposite side
Bilaterally: Flex the neck, assist to elevate the rib cage during inhalation

Scalenes

O: Anterior, middle, posterior transverse processes of C2-C7
I: Anterior and middle - first rib, posterior: second rib 
Fusiform
N: Cervical spinal nerves C3-C8
Unilaterally: Laterally flex the head and neck to the same side, rotate the head and neck to the opposite side
Bilaterally: Elevate the ribs during inhalation, flex the head and neck

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