Peripheral nervous system Two subcategories Dorsal root of spinal nerve Dorsal root ganglion Sensory or afferent Motor Sensory neuron neuron Motor or efferent Spinal Spina Divisions nerve cord Spinal Spinalnerve Somatic nervous cord Sensory receptor ystem Ventral root Skeletal (b) of spinal nerve muscle Autonomic nervous Spinal nerve system(ANS) Spinal cord d Autonomic ganglion > Sympathetic First motor neuron ))Parasympathetic Second motor neuron Effector organ(e.g, smooth >> Enteric (c) muscle) Large intestinePeripheral Nervous System • Two subcategories – Sensory or afferent – Motor or efferent • Divisions – Somatic nervous system – Autonomic nervous system (ANS) »Sympathetic »Parasympathetic »Enteric