Semispinalis muscle

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Description:

This muscle group has three parts - the semispinalis thoracis, semispinalis cervicis, and semispinalis capitis

Origin of the semispinalis thoracis:
Transverse processes of T6 to T10

Insertion of the semispinalis thoracis:
Spinous processes of C6 to T4

Origin of the semispinalis cervicis:
Transverse processes of vertebrae T1 to T6

Insertion of the semispinalis cervicis:
Sides of spinous processes of vertebrae C2 to C5

Origin of the semispinalis capitis:
Tips of transverse processes of vertebrae C7 to T6 and articular tubercles of vertebrae C4 to C6

Insertion of the semispinalis capitis:
Medial part of the area between the superior and inferior nuchal lines of the occipital bone

Actions:
Extend vertebral column

Nerve supply:
Dorsal rami of cervical and thoracic spinal nerves

Blood supply:
Branches of the subclavian and posterior intercostal arteries