Question 8

Smell

A lesion on the brain that affects cranial nerve I will impact the sense of smell. Cranial nerve I, also known as the olfactory nerve, is primarily responsible for the sense of smell.

A) Smell

This option is correct because cranial nerve I is specifically associated with the olfactory system, which is responsible for the detection of odors. Damage to this nerve directly impairs the ability to perceive smells, leading to conditions such as anosmia.

B) Sight

This option is incorrect as vision is primarily managed by cranial nerves II (optic nerve) and various other pathways in the visual cortex. A lesion affecting cranial nerve I does not influence visual perception.

C) Touch

This option is incorrect because the sense of touch is mediated by sensory nerves throughout the body, particularly through pathways involving the spinal cord and cranial nerves such as V (trigeminal nerve). Cranial nerve I has no role in the sensation of touch.

D) Taste

This option is incorrect because taste is primarily conveyed by cranial nerves VII (facial nerve), IX (glossopharyngeal nerve), and X (vagus nerve). Although smell contributes to the perception of flavor, cranial nerve I itself does not directly mediate taste.

Conclusion

The correct answer is "smell" due to the direct connection between cranial nerve I and the olfactory system. Other options, such as sight, touch, and taste, are governed by different cranial nerves and pathways, making them unaffected by lesions specifically impacting cranial nerve I.