Multiple Choice
Why are ganglia and nerves not surrounded by protective structures like the meninges of the central nervous system (CNS)?
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12. The Central Nervous System
Introduction to the Central Nervous System
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Ascending and descending tracts can be found in which area(s) of the spinal cord?
A
Central canal
B
Gray matter
C
Dorsal root ganglia
D
White matter
Verified step by step guidance1
Understand the structure of the spinal cord: The spinal cord is divided into white matter and gray matter. White matter consists of myelinated axons, while gray matter contains neuron cell bodies, dendrites, and unmyelinated axons.
Learn the function of ascending and descending tracts: Ascending tracts carry sensory information from the body to the brain, while descending tracts transmit motor commands from the brain to the body.
Identify the location of these tracts: Ascending and descending tracts are composed of myelinated axons, which are found in the white matter of the spinal cord. This is because myelination facilitates faster signal transmission.
Clarify why other options are incorrect: The central canal contains cerebrospinal fluid and does not house tracts. Gray matter is involved in processing and integration, not long-distance signal transmission. Dorsal root ganglia contain sensory neuron cell bodies and are not part of the spinal cord's white matter.
Conclude that the correct answer is white matter, as it is the region of the spinal cord where ascending and descending tracts are located.
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