ANAT-A 215 Lecture Notes - Lecture 29: Brainstem, Cardiac Muscle, Ibm System I

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9 Aug 2018
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Introduction: this is one of the motor systems. Involuntary motor neurons to smooth muscle (in the walls of hollow organs), cardiac muscle & glands. Ii. reach skeletal muscle (it does not have ganglia) The somatic (voluntary) nervous system uses a single neuron to. Structure: sympathetic = also known as thoracolumbar (= origin): 1st neuron"s cell body is in the lateral horns of spinal cord (lateral horns are found from t1-l2). Pathway: the axon of the 1st (preganglionic) neuron leaves the lateral horn, travels through the ventral root, enters the spinal nerve and leaves it via the white ramus communicans. In a peripheral (= prevertebral = collateral) ganglion (3, anterior to spinal cord) neuron is going to involuntary structures above the diaphragm. If the synapse occurs in a paravertebral ganglion, the 2nd. If the synapse occurs in a prevertebral ganglion, the 2nd neuron is going to involuntary structures below the diaphragm.

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