If sitting with the legs crossed, sensory loss will eventually occur. (Part of the limb will "fall asleep.") In what order will this loss occur? (Hint: compression of a nerve affects function in order according to axon diameter and myelination;
largest diameter myelinated axons are affected first)
A. 1. Slow pain; 2. heat; 3. fast pain; 4. cold; 5. conscious proprioception and discriminative touch
B. 1. Conscious proprioception and discriminative touch; 2. heat; 3. fast pain; 4. cold; 5. slow pain
C. 1. Conscious proprioception and discriminative touch; 2. cold; 3. fast pain; 4. heat; 5. slow pain
D. 1. Slow pain; 2. cold; 3. fast pain; 4. heat; 5. conscious proprioception and discriminative touch
ANS: C
Rationale: When a person stands up after prolonged sitting with the legs crossed, occasionally, the person finds that part of the limb has "fallen asleep." The sensory loss proceeds in the following order: 1. conscious proprioception and discriminative touch; 2. cold; 3. fast pain; 4. heat; and 5. slow pain.
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