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Sensory systems a. list on the structural difference between the cornea in fishes and the cornea...

Sensory systems

a. list on the structural difference between the cornea in fishes and the cornea in terrestrial vertebrates. b. list one functional difference between the cornea in fishes and the cornea in terrestrial vertebrates. c. what is visual accommodation? d. how is visual accommodation mediated in reptiles and mammals? e. how is visual accommodation in amphibians and fishes?

Nervous System

1. describe a general function of each of the following in mammals: Corpus Callosum Hippocampus Cerebral cortex Medulla Oblongata 2. Provide an example a sensory reflex mediated by the midbrain:

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Answer #1

a.Some fishes like sandlance have thick central cornea than the periphery. Thickness of the center of cornea is four times than the periphery while the terrestrial vertebrates have thinner cornea in the center than the periphery. The corneal epithelium in fishes is continuous with conjunctiva and skin which maintains transparency of the cornea and its hydration. Also, the anterior corneal surface of fishes is covered with microridges or microprojections, which are long and complex finger-print like projections. They increase the surface area of the cornea and increase the movement of oxygen into the cells of cornea.

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