ANATOMY

Detailed explanation-1: -A dorsal root ganglion (or spinal ganglion; also known as a posterior root ganglion) is a cluster of neurons (a ganglion) in a dorsal root of a spinal nerve. The cell bodies of sensory neurons known as first-order neurons are located in the dorsal root ganglia.

Detailed explanation-2: -Because sensory information from the body is relayed to the CNS through the dorsal roots, the axons originating from dorsal root ganglion cells are classified as primary sensory afferents, and the dorsal root’s neurons are the first order (1°) sensory neuron.

Detailed explanation-3: -Motor neurons leave the cord in collections of nerves called ventral rootlets, which then coalesce to form a ventral root. Sensory information is carried by sensory neurons in dorsal roots, which enter the cord in small bundles called dorsal rootlets.

Detailed explanation-4: -Each dorsal root fiber is the central process of a dorsal root ganglion cell. The dorsal roots contain sensory fibers from the skin, subcutaneous and deep tissues, and viscera. Primary afferent fibers of the dorsal roots are either myelinated or unmyelinated.

Detailed explanation-5: -The dorsal horns contain the cell bodies of sensory neurons. Two arms located at the front of the spinal cord, central grey matter are called ventral horns. They contain the cell bodies of motor neurons.