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| 91. | olfactory epithelium | region of the nasal epithelium where olfactory neurons are located |
| 92. | olfactory sensory neuron | receptor cell of the olfactory system, sensitive to the chemical stimuli of smell, the axons of which compose the first cranial nerve |
| 93. | opsin | protein that contains the photosensitive cofactor retinal for phototransduction |
| 94. | optic chiasm | decussation point in the visual system at which medial retina fibers cross to the other side of the brain |
| 95. | optic disc | spot on the retina at which RGC axons leave the eye and blood vessels of the inner retina pass |
| 96. | optic nerve | second cranial nerve, which is responsible visual sensation |
| 97. | optic tract | name for the fiber structure containing axons from the retina posterior to the optic chiasm representing their CNS location |
| 98. | organ of Corti | structure in the cochlea in which hair cells transduce movements from sound waves into electrochemical signals |
| 99. | osmoreceptor | receptor cell that senses differences in the concentrations of bodily fluids on the basis of osmotic pressure |
| 100. | ossicles | three small bones in the middle ear |
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