ANATOMY

GENERAL ANATOMY

NERVOUS SYSTEM

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
unmyelinated axons and neuron cell bodies in CNS
A
white matter
B
gray matter
C
neurilemma
D
neurofibrils
Explanation: 

Detailed explanation-1: -Axons are the processes that extend from neuronal cell bodies, carrying signals between those bodies. In the grey matter, these axons are mainly unmyelinated, meaning they are not covered by a whitish-colored, fatty protein called myelin. The grey matter serves to process information in the brain.

Detailed explanation-2: -The grey matter, in the center of the cord, is shaped like a butterfly and consists of cell bodies of interneurons and motor neurons, as well as neuroglia cells and unmyelinated axons.

Detailed explanation-3: -Gray matter contains collections of unmyelinated fibers and cell bodies in the central nervous system. True. The all-or-none phenomenon as applied to nerve conduction states that the whole nerve cell must be stimulated for conduction to take place.

Detailed explanation-4: -The tissue called “gray matter” in the brain and spinal cord is also known as substantia grisea, and is made up of cell bodies. “White matter", or substantia alba, is composed of nerve fibers.

Detailed explanation-5: -Gray matter, named for its pinkish-gray color, is home to neural cell bodies, axon terminals, and dendrites, as well as all nerve synapses. This brain tissue is abundant in the cerebellum, cerebrum, and brain stem. It also forms a butterfly-shaped portion of the central spinal cord.

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