ANATOMY

Detailed explanation-1: -Spinal nerves are mixed nerves that interact directly with the spinal cord to modulate motor and sensory information from the body’s periphery. Each nerve forms from nerve fibers, known as fila radicularia, extending from the posterior (dorsal) and anterior (ventral) roots of the spinal cord.

Detailed explanation-2: -Each spinal nerve is a mixed nerve, formed from the combination of nerve fibers from its dorsal and ventral roots. The dorsal root is the afferent sensory root and carries sensory information to the brain.

Detailed explanation-3: -They are formed by the union of dorsal and ventral roots. Thus, all the spinal nerves are composed of both sensory and motor fibers (mixed nerves).

Detailed explanation-4: -There are 12 pairs of cranial nerves. Unlike the spinal nerves, not all cranial nerves are mixed nerves. Some cranial nerves are mixed but some are purely sensory or motor. Cranial nerves exit from the lower portion of the brain through the opening at the base of the skull.

Detailed explanation-5: -Answer and Explanation: Spinal nerves are mixed nerves because they contain motor and sensory neurons.