Sympathetic - Sympathetic(Thoracolumbar division innervates...

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Sympathetic (Thoracolumbar) division: - innervates more organs than the parasympathetic division… in addition to supplying the visceral organs, it also supplies smooth muscle of visceral structures of the skin (sweat glands, arrector pili muscles) as well as smooth muscle of all arteries and veins - clusters of sympathetic preganglionic neurons (from spinal nerves T 1 -L 2 ) produce the lateral horns of the gray matter of the spinal cord (lateral horns are absent in the sacral region of the spinal cord (fewer parasympathetic preganglionic neurons)) - all preganglionic neurons enter a paravertebral (chain) ganglion … once there, they can: synapse with a postganglionic neuron in the same chain ganglion or ascend to synapse in a cervical chain ganglion (trunk ganglion) o spinal nerves T 1 -T 4 synapse in a superior cervical ganglion & serve the head (skin, blood vessels, stimulate dilator muscles of eyes & inhibit nasal & salivary glands) & send branches to heart o spinal nerves T 1 -T 6 synapse in a middle & inferior cervical ganglion
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