Adrenal Gland - Autonomic Nervous System Adrenal Gland *...

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Autonomic Nervous System Adrenal Gland * Each gland is actually two glands in one * outer cortex secrets cortisol when stimulated * inner medulla is a modified sympathetic ganglion * consist of modified postganglionic neurons without dendrites or axons * sympathetic preganglionic fibers penetrate through the cortex and terminate on these cells * when stimulated it secretes epinephrine and norepinephrine and a trace of dopamine into the blood stream Parasympathetic Division * also called craniosacral division * arises from brain and sacral cord * fibers travel in certain cranial and sacral nerves * preganglionic neurons located in the pons, medulla, and segments S2-S4 of cord * they issue long preganglionic fibers which end in terminal ganglia in the wall ( intramural ganglion ) or near the target organ, thus, short postganglionic fibers * there is some neural divergence, but much less than in the sympathetic * thus is relatively selective in its stimulation of target organs Parasympathetic Division
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