Semispinalis Cervicis Muscle
Semispinalis Thoracis Muscle
The semispinalis thoracis muscle is one of the intrinsic back muscles at the level of the thorax.
a. Transverse processes of T6 – T10/12 vertebrae
a. spinous processes of T1 – T4 and C6 – C7
Actions of the Semispinalis Thoracis Muscle:
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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.