Anatomy of the semispinalis cervicis tends to be variable.
Semispinalis cervicis is a thin muscle that connects the transverse processes of the upper thoracic vertebrae with the mid-cervical vertebrae. This traps and compresses the lower cervical vertebrae. It is innervated by the posterior rami of the cervical vertebrae on which it attaches.
Origin – transverse processes of T1-T5 or T6
Insertion – Spinous processes of C2-C5
Function – Extension, lateral flexion and some rotation of the lower cervicals
Semispinalis Muscle Group
The semispinalis muscle group includes:
Capitis attaches to the base of the cranium, but the other two muscles are the interspinous muscles. These muscles are deep to the extrinsic back muscles and superficial interspinous muscles. They provide another layer of paraspinal erectors to support the cervical muscles on the thoracic column.
All of these muscles all have statistically significant variations in their structure.
Note how the atlas is skipped so that these muscles easily render it in an anterior displacement.
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