The study of the nervous system, including vision, hearing, smell, and the control of movement and other behaviors. Neurotransmitter A chemical released by a neuron at a synapse to relay information to an adjacent cell. Ocular dominance The tendency of clusters of nerve cells in the visual system to respond primarily to one eye rather than to the other. A pea-sized structure on the undersurface of the frontal lobe of the brain that receives inputs from the olfactory neurons and projects to the regions of the brain concerned with the sense of smell. A neuron that senses odorant molecules.
Olfactory cells lie in the upper part of the nose.
Their outer surfaces bear hair-like cilia. From their lower surfaces the cells extend an axon that passes to the olfactory bulb. The sensory cells in the nose and the regions of the brain with which they are connected that collectively are involved in the sense of smell. Ophthalmoscope An instrument used to view the interior of the eye, especially the retina. The site on the base of the brain where roughly half the nerve fibers from each eye cross to the opposite side of the brain and half stay on the same side.