GYRUS

(Lat.), n. m. Jir(guer)'u3s(u4s). Gr., yupos. Fr., gyre. }er, ff., Ring, Windung. Lit., a ring or circle. 1. In botany, the ointed circle of the spore case of ferns: also, a shield or disc, as in he genus Gyrophora. [B, 19, 121. 123 (a, 24).] 2. The scala tympani and scala vestibuli. [L, 349.1 3. See CONVOLUTION (2d def.).,he dorsal end of the super temporal fi ure, connecting the super-.emporal and med i temporal gyri. It is more distinct in monkeys han in man. [I, 59.] See also Angular CONVOLUTION. Annectaiit;yri. Lat., gyri annectantes. See Annectant CONVOLUTIONS and jryral ISTHMUS. Antero-parietal g. [Huxley]. See Pre central g. and Ascending frontal CONVOLUTION. Antero-temporal g. Of Huxley, the super temporal g. [I, 7.] See also Superior temporo-sphenoidal CONVOLUTION. Basirrhinal g. Of Wilder, the;. at or near the tip of the temporal lobe, between the hippo am pal and amygdaline fi ures; the basirrhinal fold or tract of Owen. [I, 14.] Bridging g. See Gyral ISTHMUS. Calos.-il g. Lat., g. callosalis, g. callosus. Of Owen and Huxey, see G. fornicatus. Dentate g. See Dentate CONVOLUTION. External annectant g., First connecting g. [Turner]. See Paroccipital g. and First annectant CONVOLUTION. Gyri abrupt!. Df Valentin, the small gyri at the extremity of the occipital lobe. "I, 39.] G. anguifonnis anterior. Of Valentin, probably the mbfrontal g. [I, 39.] G. anguiform is posterior inferior. Of Valentin, the temporal gyri. [1, 6, 39.] G. a i i gular is. See Angular g.- Gyri annectantes. See Annectant CONVOLUTIONS and Gyral ISTHMUS. G. arcuatiis. YT., cir convolution arquee. See Uncinate CONVOLUTION. G. basilar is intern us. Fr..cir convolution basil a ire. interne. Of Valentin, a region on the orbital face of the frontal lobe, perhaps the g. rectus. [I, 39.] Gyri breves, Gyri breves insulae. Fr., cir convolutions courtes de rile. Of Valentin, the larger number of the insular gyri, as distinguished from the g. long us insulse. [I, 39.] G. callosalis, G. callosus. See G. fornicatus. G. central is anterior. See Pre central g. and Ascending frontal CONVOLUTION. G. central is posterior. See Post central g. Gyri cerebelli. The laminae of the cerebellum. [L, 7.J Gyrus cerebri. A cerebral convolution. G. chorioides (seu chorioideus) anterior. In the embryo, the convexity of the parietes of the lateral rece of the fourth ventricle. [I, 9, 44.] G. chorioides (seu chorioideus) inferior (seu posterior). Ger., hinterer G. chorioides. In the embryo, a second convexity of the parietes of the lateral rece of the fourth ventricle, just behind the g. chorioides anterior. [I, 9. 44.] G. chorioides (seu chorioideus) superior. See G. chorioides anterior. G. cinguli. See G. fornicatus.- Gyri cochleae. The gyri (4th def.) of the cochlea of the internal ear. [I.] Gyri colic i niedii. Fr.. cir convolutions intermedia ires inferieures. Of Valentin, the gyri at the top of the temporal lobe. [I. 39.] G. corp or is callosi. See G. fornicatus. G. cranii. See CONVOLUTION (3d def.). G. cristatus linguiform is. See G. fornicatun.G. cruciati [Valentin]. See Orbital gyri.G. cunei [Ecker]. See Gyral ISTHMUS. Gyri cunei formes. See Gyri abrupt/'. G. dentatus. See Dentate CONVOLUTION. G. descend ens [Ecker]. Ger., Endlappchen. The narrow area at the extremity of the occipital lobe, just caudad of the post calcarine fi ure. [I. 11, 17, 58.] G. divis us. See Pre central g. and Ascending frontal CONVOLUTION. G. epitheliaris. Of Rauber, one of the folds of a chorioid plexus. [I. 104.] G. fasciculi arcuati [Reil]. The temporo-sphenoidal convolutions. [I, 6, 39.J-G. fornicatus (extern us, seu hippocampi). Fr., cir convolution d'ourlet (ou de la grande fente), grande cir convolution (ou pli) du corps calleux. Ger., Bogenwulst, du eres Gewolbe, Zwingenwulst. Zwingenwindung. It., proce o enteroides crista to. The g. which borders the callosum, beginning ventrad of the genu, joined dorsad in most of its course by the cmlosal fi ure, and continuous around the splenium with the hippocampal g., with which it constitutes the grande lobe limbique of Broca, the lobus falciform is (Ger., Sichellappen) of Schwalbe. [I, 6, 7. 14, 15, 17. 98, 100.] G. fornicatus interims. See G. marginalia intern us.G. frontal is. See Pre central g. and Ascending frontal CONVOLUTION. G. frontal is inferior. See Sub frontal g.G. frontal is intern us primus. That portion of the superfrontal g. which appears on the mesal aspect of the cerebrum. [J.] G. frontal is medius. See Med i frontal g.G. frontal is primus. See Superfrontal g. and Superior frontal CONVOLUTION. G. frontal is rectus. See G. rectus. G. frontal is secund us. See Med i frontal g.G. frontal is superior. See Superfrontal g.G. frontal is tertius. See Sub frontal g.G. fronto-parietal is medial is. The mesal aspect of the superfrontal g. [I, 94.] G. fusiform is. See Sub collateral g.G. geniculi. A g. consisting of " thin strands of gray matter pa ing from the anterior extremity of the g. fornicatus over the upper surface of the corpus callosum, becoming the striee mediates et later a les of Lancisi. [C. H. Dana, " N. Y. Med. Jour.," May 4, 1889, p. 498 (a, 18).] G. glo if on nis. See Sub calcarine fir. Gyri hemispheeriorum. The cerebral convolutions. G. hippocampi (magni). See Uncinate g.G. impositus anterior (et posterior) G. incisus intern us. Of Valentin, certain ill-defined regions of the mesal aspect of the cerebrum. [I, 39.] Gyri infer i ores. See Gyri colic i medii.G. inflect us. See Inflected g.G. infra marginal is. The super temporal g. [I, 1.] G. insults Reillii [Lamdll See Gi/ri breves. G. inter central is. See Inter central (7_Gvri iiiterinedii infer i ores. Of Valentin, the gyri just cauda'd of the tip of the temporal lobe. [I, 39.] Gyri in test in a les. See Intestinal CONVOLUTIONS. G. lingual is. See Sub collateral g. and Sub calcarine g.G. longitudinal is superior intern us. Fr., cir convolution longitndinale superieure interne. too; U2, blue: U3, lull; U4, full; U6, urn; U, like fi (German). [s. 261]