BIOL 030 Lecture Notes - Lecture 19: Autonomic Nervous System, Sympathetic Nervous System, Motor System

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The ans is also known as the visceral motor system and is responsible for transmitting involuntary signals from the cns to smooth muscle, cardiac muscle, and glands. The ans is a two neuron pathway, meaning simply that between the cns and any target organ, there are two neurons. The preganglionic neuron: has its cell body within the cns. The axons enter into the pns and travels to the autonomic ganglion. The autonomic ganglion: is where the preganglionic and postganglionic neurons meet and communicate. The postganglionic neuron: is entirely in the pns. Its cell body is the autonomic ganglion, while its axon travels to the target organ. Sympathetic: origin: spinal cord segment t1-l2, response: fight or flight, effect: widely distributed to many parts of the body. Parasympathetic: origin: brainstem and spinal cord segment s2-s4, response: rest and digest, effect: more limited distribution to target organs, with localized effect.

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