Question

multiple choice 2 points
a mixed nerve consists of both ____ and ____
afferent; efferent fibers
glial cells; nerve cells
myelinated; unmyelinated fibers
spinal; cranial fibers
interneurons; efferent neurons

Explanation:

Define mixed nerves

A mixed nerve contains both sensory and motor axons. In anatomical terms, sensory pathways are afferent, while motor pathways are efferent.

Analyze the options

• afferent; efferent fibers: This matches the definition of a mixed nerve, which transmits both sensory (afferent) inputs to the central nervous system and motor (efferent) outputs to effectors.
• glial cells; nerve cells: Glial cells support neurons, but this does not define a "mixed" nerve.
• myelinated; unmyelinated fibers: While nerves can contain both, this is not the defining characteristic of a mixed nerve.
• spinal; cranial fibers: A nerve is either a spinal nerve or a cranial nerve, not a mixture of both in this context.
• interneurons; efferent neurons: Interneurons are located entirely within the central nervous system and are not bundled into peripheral nerves.

Select the correct option

The correct option is "afferent; efferent fibers".

Answer:

• afferent; efferent fibers (Correct answer)
• glial cells; nerve cells
• myelinated; unmyelinated fibers
• spinal; cranial fibers
• interneurons; efferent neurons