Semispinalis Cervicis Muscle
Semispinalis Thoracis Muscle
a. Transverse processes of T6 – T10/12
a. spinous processes of T1 – T4 and C6 – C7
Actions of the Semispinalis Thoracis Muscle:
a. Bilaterally extends cervical (neck) and thoracic (back) vertebrae.
b. Unilaterally laterally flexes flexes cervical and thoracic vertebrae.
c. Unilaterally rotates cervical and thoracic vertebrae to opposite side (= contralateral rotation).
Nerve to the Semispinalis Thoracis Muscle
a. Dorsal rami of upper thoracic spinal nerves.