Human Anatomy and Physiology : Peripheral Nervous System
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Example Questions
Example Question #51 : Peripheral Nervous System
Which dermatome is responsible for sensation at the level of the nipple?
T10
L4
C4
T4
C2
T4
The dermatome responsible for sensation at the level of the nipple is T4.
C2 is responsible for sensation at the posterior half of the skull "cap" and C4 at the level of a low collar shirt. T10 is responsible for sensation at the level of the navel (to remember this think bellybutton...belly buTEN). L4 includes the kneecaps.
Example Question #612 : Systems Physiology
What are astrocytes?
Cells that provide support and nutrition to neurons
Cells that insulate the axons of some neurons
Cordlike structures that transmit nerve impulses
Single nerve axons
Cells that provide support and nutrition to neurons
Astrocytes provide support and nutrition to neurons within the brain and spinal cord. Myelin sheath insulates the axons of some neurons which allows them to conduct impulses faster. Nerve fibers are single nerve axons that are surrounded by a sheath of connective tissue. Nerves themselves are cordlike structures that transmit nerve impulses.
Example Question #613 : Systems Physiology
What fiber(s) are associated with the perception of pain?
A delta and C fibers
A alpha, A beta, and A delta fibers
A beta
A alpha
C fibers
A delta and C fibers
Both A delta and C fibers are associated with the perception of pain. This can be broken down more specifically to A delta fibers that are slightly mylinated and carry "Fast" sharp pain that is immediately felt. While C fibers carry "slow" pain due to being unmyelinated and is associated with chronic pain.
Example Question #614 : Systems Physiology
Which fiber type is associated with chronic pain?
Ruffini endings
A delta
A alpha
A beta
C fiber
C fiber
C fibers are associated with chronic pain perception because they transmit "slow pain". This is due to the fibers being unmyelinated. In addition, these fibers send projections to the limbic system and the thalamus which causes the brain to develop chronic pain associations.
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