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Ch. 13 The Peripheral Nervous System
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All textbooksErin C. Amerman 2nd EditionCh. 13 The Peripheral Nervous SystemProblem 13.5a

Chapter 13, Problem 13.5a

Which cranial nerves are sensory only, primarily motor, and mixed?

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Hey, everyone. Let's take a look at this question together. The following are purely affluent sensory nerves. Is it answer choice? A cranial nerve one answer choice B, cranial nerve 12 answer choice C cranial nerve five or answer choice D cranial nerve seven. Let's work this problem out together to try to figure out which of the following answer. Choices is a cranial nerve that is a purely affluent sensory nerve. So in order to solve this question, we have to recall what we have learned about affluent sensory nerves to determine which of the following is a purely affluent sensory nerve. And we can recall that afferent neurons conduct sensory information and some sensory nerves include cranial nerve one which conducts sensory information from the olfactory region. Cranial nerve two which conducts sensory information from the retina of the eye. And lastly, cranial nerve eight which conducts sensory information from inner ear structures. So looking at our answer choices, we can identify answer choice, a cranial nerve one as the correct answer. Since cranial nerve, one is a purely affluent sensory nerve which conducts sensory information from the olfactory region. And all other answer choices are incorrect as answer choice. BC and D are not purely sensory nerves. I hope you found this video to be helpful. Thank you and goodbye.
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Related Practice
Textbook Question

Define each of the following terms in your own words, using 20 or fewer words.



c. Posterior root ganglion

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Textbook Question

First, write the Roman numeral that corresponds to each named cranial nerve (after the abbreviation CN). Second, match the cranial nerve with its correct function from the column on the right.


CN____               

______Vestibulocochlear nerve

CN____           ​ ​

______Trigeminal nerve

CN____           ​ ​

_______Hypoglossal nerve

CN____           ​ ​

_______Abducens nerve

CN____           ​ ​

_______Vagus nerve

CN____           ​ ​

_______Olfactory nerve

CN____            ​ ​

_______Accessory nerve

CN____           ​ ​

_______Oculomotor nerve

CN____           ​ ​

_______Facial nerve

CN____           

_______Optic nerve

CN____           ​ ​

_______Glossopharyngeal nerve

CN____           

_______Trochlear nerve


a. Motor to the lateral rectus muscle

b. Motor to the muscles of facial expression; lacrimation; salivation; taste to the anterior two-thirds of the tongue

c. Sense of smell

d. Motor to the muscles for swallowing; salivation; taste to the posterior one-third of the tongue; somatic sensation from the throat

e. Senses of hearing and equilibrium

f. Motor to the superior oblique muscle

g. Motor to the tongue

h. Motor to the sternocleidomastoid and trapezius muscles

i. Sense of vision

j. Motor to muscles of swallowing and speaking; parasympathetic innervation to thoracic and abdominal viscera; sense of taste from the throat

k. Sensory to the face; motor to the muscles of mastication

l. Motor to four of six extrinsic eye muscles; constricts the pupil; changes the shape of the lens; opens the eyelid

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Textbook Question

Maria is a 3-year-old who has been diagnosed with CIPA, or congenital insensitivity to pain with anhidrosis. This disease results from a genetic mutation that causes essentially all general sensory neurons to not function properly. What types of sensations will Maria be unable to detect (be specific)? Predict what problems she might face from her condition.

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Textbook Question

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.


e. There are 31 pairs of spinal nerves and 12 pairs of cranial nerves.

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Textbook Question

Match the following nerves with the structures they innervate.     


____Phrenic nerve     

____Median nerve     

____Femoral nerve     

____Tibial nerve     

____Radial nerve     

____Intercostal nerves     

____Common fibular nerve     

____Musculocutaneous nerve


a. Motor to the triceps brachii muscle and muscles in the forearm that extend the hand; sensory from the posterior hand

b. Motor to the muscles in the anterior arm that flex the forearm; sensory from skin over the lateral forearm

c. Motor to the muscles in the anterior and lateral leg that evert and dorsiflex the foot; sensory from the skin of the anteroinferior leg

d. Motor to the diaphragm muscle

e. Motor to the muscles in the anterior thigh extend the knee; sensory from the skin over the anterior thigh and leg

f. Motor to the hamstring muscles that extend the thigh and flex the leg, muscles of the leg that plantarflex the foot, and muscles of the foot; sensory from the skin over the posterior and lateral leg and foot

g. Motor to the muscles between the ribs and the abdominal muscles; sensory from the skin over the abdomen

h. Motor to the muscles in the forearm that flex the hand, certain intrinsic hand muscles; sensory from the skin of the anterior hand

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Textbook Question

First-order somatic sensory neurons are_____neurons whose cell bodies are located in the_____.​​


a. multipolar, posterior horn

b. pseudounipolar, posterior root ganglion

c. bipolar, anterior horn

d. pseudounipolar, posterior horn

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