Define gyrus. gyrus synonyms, gyrus pronunciation, gyrus translation, English dictionary definition of gyrus. n. pl. gyÂ·ri A rounded ridge, as on the surfaces of the cerebral hemispheres. n , pl gyri another name for convolution3 n., pl. gyâ¢ri a convoluted fold of...
olfactory nerve. n. Any of numerous olfactory filaments in the olfactory portion of the nasal mucosa that enter the olfactory bulb, where they terminate in synaptic contact with mitral cells, tufted cells, and granule cells. Also called first cranial nerve.he fibers pass into the skull and form synapses with the dendrites of the mitral cells. The area in which the olfactory nerves arise is situated in the most superior part of the mucous membrane that covers the superior nasal concha.
Derived from the embryonic nasal placode, the olfactory nerve is somewhat unique among cranial nerves because it is capable of some regeneration if damaged.esions to the olfactory nerve can occur because of blunt trauma, such as coup-contra-coup damage, meningitis, and tumors of the frontal lobe. They often lead to a reduced ability to taste and smell. However, lesions of the olfactory nerve do not lead to a reduced ability to sense pain from the nasal epithelium.