Posterior Root of Seventh Cervical Nerve (Right)

Origin

The posterior root of the seventh cervical nerve originates just lateral to or in the intervertebral foramen, between the sixth and seventh cervical vertebrae. This corresponds to the point where the cervical nerve splits into anterior and posterior roots.

Course

The posterior root of the seventh cervical nerve runs medially towards the posterior side of the spinal cord. Adjacent to the appropriate spinal cord level, the posterior root splits into smaller rootlets, which enter the posterior spinal cord in line with the dorsal horn of the gray matter.

Branches

There are no branches of the posterior root of the seventh cervical nerve. The proximal end of the posterior root has a bulge called the spinal (or dorsal root) ganglion, which is the location of the neuronal cell bodies of the neurons that form the posterior root.

Supplied Structures

Sensory afferent from the skin around second and third finger and posterior aspect of the upper limb are relayed to the posterior root via the anterior ramus of the seventh cervical nerve.

The sensory afferent neurons, which provide innervation to the skin above the trapezius, transmit general sensory information to the posterior root via the posterior ramus of the seventh cervical nerve.