Rectus capitis anterior

The rectus capitis anterior (Latin: musculus rectus capitis anterior) is a short muscle located anterior to the vertebral column. It stretches between the atlas and the base of the skull. The rectus capitis anterior is known as one of the prevertebral neck muscles. This muscle also belongs to the anterior neck muscles. The rectus capitis anterior provides the flexion of the head.

Origin

The rectus capitis anterior muscle originates from the anterior surface of the lateral mass and transverse process of the atlas (C1).

Insertion

The fibers of the rectus capitis anterior insert on the inferior surface of the basilar part of the occipital bone.

Action

Upon contraction, the rectus capitis anterior muscle aids in flexion of the head at the atlanto-occipital joint.

Innervation

The rectus capitis anterior is innervated by the branches arising from the loop between the anterior rami of the 1st and 2nd cervical spinal nerves (C1 - C2).

Blood supply

The rectus capitis anterior muscle receives arterial blood supply from the branches of the vertebral and ascending pharyngeal arteries. The first one is a branch of the subclavian artery, while the latter is a branch of the external carotid artery.