Innervation of the Skin and Primary Afferent Axons Quiz

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Which type of axons bring information from the somatic sensory receptors to the spinal cord or brain stem?

Secondary afferent axons

Primary afferent axons (correct)

Interneurons

Motor axons

Where are the cell bodies of the primary afferent axons located?

Ventral roots

Brain stem

Dorsal roots (correct)

Spinal cord

What determines the size of primary afferent axons?

Presence of myelin

Speed of action potential conduction

Type of sensory receptor (correct)

Location in the body

What are the two sets of names used to designate the different sizes of axons?

Arabic and Greek letters, Roman numerals Signup and view all the answers

Which type of axons are unmyelinated?

Group C (or IV) axons Signup and view all the answers

What is the diameter of the smallest axons, the C fibers?

Less than about 1 μm Signup and view all the answers

What types of sensations do C fibers mediate?

Pain, temperature sensation, and itch Signup and view all the answers

What is the speed of action potential conduction along C fibers?

About 0.5–1 m/sec Signup and view all the answers

What determines the speed of action potential conduction in axons?

Diameter of the axon and presence of myelin Signup and view all the answers

How fast is the conduction of action potentials along C fibers compared to taking a step?

Slower than taking a step Signup and view all the answers

Innervation of the Skin and Primary Afferent Axons Quiz

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Questions and Answers

Which type of axons bring information from the somatic sensory receptors to the spinal cord or brain stem?

Where are the cell bodies of the primary afferent axons located?

What determines the size of primary afferent axons?

What are the two sets of names used to designate the different sizes of axons?

Which type of axons are unmyelinated?

What is the diameter of the smallest axons, the C fibers?

What types of sensations do C fibers mediate?

What is the speed of action potential conduction along C fibers?

What determines the speed of action potential conduction in axons?

How fast is the conduction of action potentials along C fibers compared to taking a step?

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