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Cranial nerve III, also known as the oculomotor nerve, is primarily responsible for eye movement and pupil constriction. In humans, it emerges from the midbrain, specifically from the interpeduncular fossa, and has a more complex pathway due to the intricate structure of the human brain. In sheep, while cranial nerve III also originates from the midbrain, its anatomical course is simpler, reflecting the less complex visual and motor requirements of their environment. Overall, the main difference lies in the organizational complexity and the functional demands placed on the nerve in each species.

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3mo ago

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