Deep structures of the neck: Prevertebral muscles

The neck is the anatomical region between the base of the cranium superiorly and the clavicles inferiorly and it joins the head to the trunk and limbs, serving as a major conduit for structures passing between them.

The neck contains superficial structures, located in the anterior and posterior triangles and deep structures, like the cervical viscera and the prevertebral muscles.

Now, the prevertebral muscles are deep to the prevertebral layer of the deep cervical fascia and they are divided into anterior prevertebral muscles and lateral prevertebral muscles.

The anterior prevertebral muscles are located directly posterior to the retropharyngeal space and medial to the neurovascular plane of the cervical plexus, brachial plexus and subclavian artery, and they are represented by longus colli, longus capitis, rectus capitis anterior and anterior scalene muscles.

Now, the longus colli originates from the bodies of C5 to T3 vertebrae and the transverse processes of C3 to C5 vertebrae.

It inserts onto the anterior tubercle of the C1 vertebra, the bodies of the C2 to C4 vertebrae and the transverse processes of C3 to C6 vertebrae.

It’s innervated by the anterior rami of C2 to C6 spinal nerves

When it contracts bilaterally, it produces flexion of the neck and when it contracts unilaterally it produces rotation to the opposite side.

Next, there’s the longus capitis, which originates from the anterior tubercles of the transverse processes of C3 through C6 and inserts onto the basilar part of occipital bone.

It’s innervated by the anterior rami of spinal nerves C1 through C3 and its contraction results in flexion of the head at the atlanto-occipital joint.