ANP 1106 Lecture Notes - Autonomic Ganglion, Motor Neuron, Sympathetic Nervous System

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1106

Document Summary

Skeletal muscles and visceral organs are involved to change internal and external conditions. Keeps nrg use as low as possible. Examples are a rapidly pounding heart, deep breathing, dry mouth, sweaty skin, dilated pupils. Happens during any type of vigorous active activity. Enables body to cope with potential threats to homeostasis. Differences in the physiology of the effector organs accounts for most of the remaining differences btwn somatic and autonomic effects of their target organs. The ans uses a two-neuron chain to reach its effectors: The preganglionic neuron"s axon synapses with the 2nd motor neuron. The postganglionic neuron"s cell body is an autonomic ganglion outside the cns. Autonomic postgang fibers release 2 nts (ne and ach) Effects can be excitatory or inhibitory depending of the target organ. Higher brain centres regulate and coordinate somatic and autonomic motor activities and most spinal nerves contain somatic and autonomic fibres. Pregang fibres rub in the oculomotor, facial, glossopharyngeal, and vagus cranial nerves.