PC1001 Lecture Notes - Lecture 11: Somatic Nervous System, Autonomic Nervous System, Skeletal Muscle
Document Summary
Sensory neurons are related to touch, pain, temperature, and proprioception (sense of self position), sight, hearing, taste, smell and equilibrium. Receives input from sensory receptors located in organs, blood vessels, muscles and the nervous system and regulates visceral activities by excitation or inhibition. The axon of a single, myelinates somatic motor neuron extends from the central nervous system to the skeletal muscle fibre it innervates. Most autonomic motor pathways consist of two motor neurons in series. The first (preganglionic neuron) has its cell body in the central nervous system. The second (postganglionic neuron) has its unmyelinated axon extending from the ganglion to the effector (smooth muscle, cardiac muscle, or gland). Often referred to as fight-or-flight division because its stimulation leads to increased alertness and metabolism to be ready for an emergency. Referred to as the rest-and-digest division as its stimulation slows down most body activity. Sites of synapses between preganglionic and postganglionic neurons.
