Anatomy

Origin

Spinalis Capitis: Side of spinous process of C7 Spinalis Cervicis: Ligamentum nuchae, spinous procesCapitis: s of seventh cervical vertebra and first 2 thoracic (C7-T2) Spinalis Thoracis: Spinous processes of lower two thoracic (T11, T12) and upper two lumbar (L1, L2) vertebrae

Insertion

Spinalis Capitis: Near the midline between superior and inferior nuchal lines of occipital bone Spinalis Cervicis: Spinous process of C2-C3 and C4 Spinalis Thoracis: Spinous processes of upper thoracic vertebrae (T1–T8)

Nerve

Spinalis Capitis: Dorsal rami of cervical spinal nerves (C1 to C3) Spinalis Cervicis and Spinalis Thoracis: Dorsal primary divisions of spinal nerves 

Actions

Extends vertebral column