Dorsal ramus of spinal nerve
All medial branches additionally also provide sensory innervation to the zygapophyseal joints and periosteum of the vertebral column.It also branches to form the grey and the white rami communicantes which make connections with the sympathetic ganglia.After it is formed, the dorsal ramus of each spinal nerve travels backward, except for the first cervical, the fourth and fifth sacral, and the coccygeal.Dorsal rami divide into medial, intermediate, and lateral branches.The posterior rami remain distinct from each other, and each innervates a narrow strip of skin and muscle along the back, more or less at the level from which the ramus leaves the spinal nerve.