Textbook Question
The lower motor neurons that innervate contractile skeletal muscle fibers are called:
a. α-motor neurons
b. β-motor neurons
c. upper motor neurons
d. γ-motor neurons
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13. The Peripheral Nervous System
Organization of Sensory Pathways
Multiple Choice
Which of the following regions of the body has the largest area of sensory cortex devoted to it?
A
Back
B
Fingers
C
Thigh
D
Elbow
Verified step by step guidance1
Understand that the sensory cortex is part of the brain responsible for processing sensory information from different parts of the body.
Recognize that the amount of sensory cortex devoted to a body region is proportional to the sensitivity and the density of sensory receptors in that region.
Consider the body regions listed: back, fingers, thigh, and elbow. Think about which of these areas have the highest density of sensory receptors.
Recall that the fingers have a high density of sensory receptors, allowing for fine tactile discrimination and sensitivity.
Conclude that the fingers have the largest area of sensory cortex devoted to them due to their high sensitivity and receptor density compared to the other regions listed.
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