It Is Difficult to Assess the Integrity of Cranial Nerve

question 25

Multiple Choice

It is difficult to assess the integrity of cranial nerve IX apart from X because:

• A)cranial nerve IX mediates the gag reflex elicited at the base of the tongue,which is also a function of X
• B)it is difficult to elicit the sensory portion of the pharyngeal gag reflex,which is the only function of cranial nerve IX
• C)it is often the case that the sensory portion of the gag reflex is intact without a motor component
• D)the vagus nerve has a larger role in the sensory and motor functions of the glossopharyngeal nerve
• E)both B and D

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Definitions:

Absorption

The psychological phenomenon of becoming fully immersed and engaged in an activity to the point of losing awareness of one's surroundings.

Metabolizes

The biochemical process by which organisms convert substances into energy and materials necessary for cellular function and growth.

Dopamine

Neurotransmitter in the brain, excess amounts of which have been thought to cause schizophrenia.

Reuptake

Process in which a sending neuron reabsorbs some of the neurotransmitter in the synapse, decreasing the amount left in the synapse.