Comprehension Check

Olfaction and audition are much better developed in domestic animals than in humans, whereas vision is less important. How do these differences inform us about the total sensory experience of domestic animals in comparison with ours?

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* Anterior and posterior, in front of and behind, respectively, are used instead of rostral and caudal to refer to the eye.

* A vomeronasal organ is not found in human adults; it makes an appearance during development but later regresses, although vestiges occasionally survive within the nasal septum. Because stimulation of the vomeronasal organ is known to affect the activity of gonadotropin-releasing hormone (GnRH) neurons, it is interesting to learn that these neurons have an unusual origin in the olfactory placodes. Their definitive locations are diffusely and variously spread (according to species) within the hypothalamic region of the brain.