Multiple Choice
The white matter of the spinal cord is ______ to the gray matter.
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12. The Central Nervous System
Introduction to the Central Nervous System
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In the spinal cord, which of the following statements is correct regarding the arrangement of white and gray matter?
A
Gray matter surrounds the white matter.
B
White and gray matter are evenly mixed throughout the spinal cord.
C
There is no white matter present in the spinal cord.
D
White matter surrounds the gray matter.
Verified step by step guidance1
Understand the basic structure of the spinal cord: The spinal cord is composed of two types of tissue—white matter and gray matter. White matter consists of myelinated axons, while gray matter contains neuron cell bodies, dendrites, and unmyelinated axons.
Visualize the arrangement: In the spinal cord, gray matter is located centrally and has a butterfly or H-shaped appearance when viewed in cross-section. White matter surrounds this central gray matter.
Recall the function of white matter: White matter is responsible for transmitting signals to and from the brain and between different levels of the spinal cord. Its peripheral location allows efficient communication.
Contrast the incorrect options: Gray matter does not surround white matter; instead, it is central. White and gray matter are not evenly mixed, as they are distinctly organized. Additionally, white matter is present in the spinal cord, contrary to the third incorrect option.
Confirm the correct statement: Based on the anatomical arrangement, the correct answer is that white matter surrounds the gray matter in the spinal cord.
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