White matter (in the central nervous system) contains:

Question

BlackTom AI · Accepted Answer

Starting with the question: 'White matter (in the central nervous system) contains:'.
Option 1 states: 'Myelinated axons and glial cells.' In the CNS, white matter is primarily composed of myelinated axons that form bundles for long-distance signaling, and it also contains glial cells such as oligodendrocytes, astrocytes, and microglia that support and insulate these fibers. This combination is characteristic of white matter.
Option 2 suggests: 'Axons, dendrites and synapses.' This description is more typical of gray matter, where neuronal cell bodies and synaptic connections are abundant; dendrites and synapses are less prominent in white matter.
Option 3 claims: 'Unmyelinated axons and myelinated dendrites.' The presence of dendrites, especially myelinated ones, is not a defining feature of white matter, and white matter is notable for myelinated axons rather than unmyelinated ones dominating its content.
Option 4 says: 'Myelinated axons but few or no glial cells.' While myelinated axons are key, glial cells are plentiful in white matter and play essential roles in maintenance and insulation, so the assertion of few or no glial cells is inaccurate.
In sum, the combination of myelinated axons with a substantial glial population best matches the known composition of CNS white matter, whereas the other options mischaracterize the cellular makeup by attributing features more typical of gray matter or by denying the presence of glia.

ANAT20006_2025_SM1 ADSL 1 Test : Nervous System

White matter (in the central nervous system) contains:

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