Which of the following cranial nerves are responsible for carrying nerve impulses associated with the special senses?

Question

BlackTom AI · Accepted Answer

First, identify the cranial nerves and the special senses they are associated with. Olfactory (I) carries smell, a classic special sense. Optic (II) carries vision, another special sense. Vestibulocochlear (VIII) carries hearing and balance, which are considered special senses as well. Glossopharyngeal (IX) carries taste from the posterior third of the tongue, a taste (special sense) modality.

Option 1: '1, 2, 5, 8' includes cranial nerve V (trigeminal), which primarily conveys general somatic sensation (touch, pain, proprioception) from the face and doesn’t represent a special sense. So this option is incorrect due to the inclusion of 5.

Option 2: '1, 2, 7, 10' lists cranial nerve VII (facial) which does carry taste from the anterior two-thirds of the tongue (a special sense), and cranial nerve X (vagus) which also contributes to taste, but the set omits the clearly established inclusion of VIII (vestibulocochlear) in the standard grouping of primary special sensory nerves. This makes the option unreliable as a correct collection for the stated question.

Option 3: '1, 2, 8, 9' includes I (smell), II (vision), VIII (hearing/balance), and IX (taste). All four are associated with special senses or taste, fitting the question's criterion about carrying impulses for special senses. This aligns with the common anatomical understanding that these nerves convey sensory information that is categorized as special senses.

Option 4: '1, 2, 8, 11' contains XI (accessory) which is primarily a motor nerve to neck muscles and is not involved in special sensory modalities. This makes the option incorrect.

In summary, the key issue is whether each listed nerve is responsible for carrying impulses related to special senses. Only option 3 consistently includes nerves whose primary roles involve special senses (I for smell, II for vision, VIII for hearing/balance, IX for taste). The other options either include nerves not associated with special senses (V or XI) or omit nerves that are typically included with special senses (such as VII or X in some contexts), making them incorrect given the standard framing of this question.

hk_264_120258_248438 Chapter 7 Self Test: Nervous System and Special Senses

Which of the following cranial nerves are responsible for carrying nerve impulses associated with the special senses?

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