area

(a're-ah) [L. a courtyard. ] i. Any circumscribed surface or space; region. ^. AH of the part supplied by a given artery or nerve. 3. A part of an organ having a special function, as the motor area of the brain, a. acus'tic a [BNA], acoustic a., an area in the floor of the fourth ventricle over which run the strias meduUares; the lower part embraces the trigonum acustici. u. Cel'si, alopecia are at a, a. cribro'sa, cribriform area, cribrum bene dictum; (a) the apex of a renal papilla pierced by the openings of the excretory tubules, foramina papillar i a; (b) the area surrounding the renal papillae marked by numerous depre ions where the ve els and nerves enter and leave the substance of the kidney, a. gas'- trica, one of a niunber of small polygonal areas, separated by linear depre ions, on the surface of the mucous membrane of the stomach; they contain the gastric foveolae. a. genninati'va, germinal a., the place in the ovum where the embryo begins to be formed, a. opa'ca, the outer portion of the a. germinativa. a. parolfacto'ria, parol factory a., Broca's a., a small and indistinctly defined gyrus on the mesial surface of the hemisphere between the subcallosal and the superior frontal gyri, from which it is separated by respectively the posterior and anterior parol factory sulci, a. pellu'cid a, the clear center of the a. germinativa. a. vasculo'sa, the part of the a. opaca when the first blood ve els appear, a. vitelli'na, the part of the ovum outside the a. germinativa. a ocia'tion a., any a. in the brain connecting one sensory a. with another, mo'tor a., the cortical portion of the brain embraced in the frontal and parietal ascending convolutions, sen so'rial or sen's ory a., the general surface of the cerebral hemispheres outside of the motor a. silent a., any area of the cerebral or cerebellar surface, lesion of which occasions no definite sensory or motor symptoms. ven'tral a., 'anterior root zone, a collection of special nerve fibers in the posterior ftmiculus, or white column, of the spinal cord, near the posterior septtun. vis'ual a., the occipital lobe and angular gyrus of each cerebral hemisphere.