The white rami communicantes contain what kind of fibers?
a. Preganglionic parasympathetic
b. Postganglionic parasympathetic
c. Preganglionic sympathetic
d. Postganglionic sympathetic

검증된 단계별 안내

Step 1: Understand the role of rami communicantes in the autonomic nervous system. They are nerve fibers that connect the spinal nerves to the sympathetic trunk (chain ganglia).

Step 2: Recall that there are two types of rami communicantes: white rami communicantes and gray rami communicantes. Each carries different types of fibers.

Step 3: Know that white rami communicantes carry myelinated preganglionic sympathetic fibers from the spinal cord to the sympathetic ganglia. These fibers are responsible for transmitting signals from the central nervous system to the sympathetic ganglia.

Step 4: Contrast this with gray rami communicantes, which carry unmyelinated postganglionic sympathetic fibers from the sympathetic ganglia back to the spinal nerves to reach target organs.

Step 5: Based on this understanding, identify that the white rami communicantes contain preganglionic sympathetic fibers.

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주요 개념

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White Rami Communicantes

White rami communicantes are nerve fibers that connect the spinal nerves to the sympathetic trunk. They carry myelinated preganglionic sympathetic fibers from the spinal cord to the sympathetic ganglia, enabling the transmission of signals in the sympathetic nervous system.

Preganglionic vs. Postganglionic Fibers

Preganglionic fibers originate in the central nervous system and synapse in autonomic ganglia, while postganglionic fibers extend from these ganglia to target organs. Preganglionic fibers are typically myelinated, allowing faster signal conduction.

Sympathetic vs. Parasympathetic Fibers

The autonomic nervous system has two divisions: sympathetic and parasympathetic. Sympathetic fibers prepare the body for 'fight or flight' responses, while parasympathetic fibers support 'rest and digest' functions. White rami communicantes specifically carry sympathetic fibers.

The white rami communicantes contain what kind of fibers?a. Preganglionic parasympatheticb. Postganglionic parasympatheticc. Preganglionic sympatheticd. Postganglionic sympathetic