10 Questions
Which type of axons bring information from the somatic sensory receptors to the spinal cord or brain stem?
Primary afferent axons
Where are the cell bodies of the primary afferent axons located?
Dorsal roots
What determines the size of primary afferent axons?
Type of sensory receptor
What are the two sets of names used to designate the different sizes of axons?
Arabic and Greek letters, Roman numerals
Which type of axons are unmyelinated?
Group C (or IV) axons
What is the diameter of the smallest axons, the C fibers?
Less than about 1 μm
What types of sensations do C fibers mediate?
Pain, temperature sensation, and itch
What is the speed of action potential conduction along C fibers?
About 0.5–1 m/sec
What determines the speed of action potential conduction in axons?
Diameter of the axon and presence of myelin
How fast is the conduction of action potentials along C fibers compared to taking a step?
Slower than taking a step
Test your knowledge on the innervation of the skin and the role of primary afferent axons in the somatic sensory system. Challenge yourself with questions on the dorsal roots, spinal cord entry, and the location of cell bodies.
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