Spinalis

Musculus spinalis

Core CoreBackSpinal ErectorsPosterior Chain

The spinalis is the smallest and most medial of the three erector spinae columns, running closest to the spinous processes. It assists spinal extension and, in its cervical and cranial portions, extension and rotation of the head and neck. It contributes to the deep extensor work that stabilizes the spine during heavy hinging and squatting.

Actions

Spinal extension, Lateral flexion of the head and neck (unilateral), Extension of the head and neck

Origin

Spinous processes of the upper lumbar and lower thoracic vertebrae (thoracis); nuchal ligament and spinous process of C7 (cervicis)

Insertion

Spinous processes of the upper thoracic vertebrae (thoracis); spinous process of the axis (cervicis); occipital bone via blending with semispinalis capitis (capitis)

Innervation

Posterior (dorsal) rami of the spinal nerves

Blood supply

Lateral sacral and posterior intercostal arteries

Heads

Spinalis thoracis, Spinalis cervicis, Spinalis capitis

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