Contain a mixture of sensory and motor neurons.
Ventral primary ramus (a mixed nerve containing both motor and sensory fibers) | First branch off of the ventral side of the spinal nerve | To skeletal mm. of the neck, trunk and extremities; sympathetic innervation to the skin | General sense (touch, pressure, pain, heat, cold, etc.) to the skin of the trunk (except the back) and extremities; visceral pain via the white rami of the sympathetic nervous system; proprioceptive sense from muscles, tendons and joints (T1-L2) |