Relate each of the following terms or phrases to either the sympathetic (S) or parasympathetic (P) division of the autonomic nervous system:
(1) Short preganglionic, long postganglionic fibers
(2) Intramural ganglia
(3) Craniosacral part
(4) Adrenergic fibers
(5) Cervical ganglia
(6) Otic and ciliary ganglia

Guida verificata passo dopo passo

Step 1: Understand the basic anatomical and functional differences between the sympathetic (S) and parasympathetic (P) divisions of the autonomic nervous system. The sympathetic division typically has short preganglionic fibers and long postganglionic fibers, while the parasympathetic division has long preganglionic fibers and short postganglionic fibers.

Step 2: For the term 'Short preganglionic, long postganglionic fibers,' identify which division matches this description. Recall that the sympathetic division is characterized by short preganglionic and long postganglionic fibers.

Step 3: For 'Intramural ganglia,' recognize that these ganglia are located within or very close to the target organ walls, a hallmark of the parasympathetic division.

Step 4: 'Craniosacral part' refers to the origin of the parasympathetic division, which arises from the brainstem (cranial nerves) and sacral spinal cord segments, distinguishing it from the thoracolumbar origin of the sympathetic division.

Step 5: 'Adrenergic fibers' release norepinephrine as their neurotransmitter and are typically associated with the sympathetic division, whereas parasympathetic fibers are cholinergic (release acetylcholine).

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Sympathetic and Parasympathetic Divisions of the Autonomic Nervous System

The autonomic nervous system has two main divisions: sympathetic and parasympathetic. The sympathetic division prepares the body for 'fight or flight' responses, while the parasympathetic division supports 'rest and digest' activities. Each division has distinct anatomical and functional characteristics that influence organ function differently.

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Review of the Sympathetic and Parasympathetic Divisions

Preganglionic and Postganglionic Fiber Lengths

Preganglionic fibers originate in the central nervous system and synapse in autonomic ganglia, where they connect to postganglionic fibers that reach target organs. In the sympathetic division, preganglionic fibers are typically short and postganglionic fibers are long, whereas in the parasympathetic division, preganglionic fibers are long and postganglionic fibers are short.

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Types and Locations of Autonomic Ganglia

Autonomic ganglia are clusters of nerve cell bodies where preganglionic neurons synapse with postganglionic neurons. Sympathetic ganglia include paravertebral (e.g., cervical) and prevertebral ganglia, while parasympathetic ganglia are often intramural (within or near target organs) or specific named ganglia like otic and ciliary ganglia.

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