A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . limb Of .Syhial fissure; »S2., ascending limb; S*., posterior horizontal limb; T., temporal operculum.(From Cunninghams Anatomy.) the temporal, fronto-parietal, frontal and orbitaloperculum. The temporal and fronto-parietal oper- cula begin to appear about the end of the fifth month;the orbital and frontal opercula develop much later 334 fissure, between which it hes. When strongly de-veloped, it separates the two Sylvian limbs frciineach other to such an extent th
A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . limb Of .Syhial fissure; »S2., ascending limb; S*., posterior horizontal limb; T., temporal operculum.(From Cunninghams Anatomy.) the temporal, fronto-parietal, frontal and orbitaloperculum. The temporal and fronto-parietal oper- cula begin to appear about the end of the fifth month;the orbital and frontal opercula develop much later 334 fissure, between which it hes. When strongly de-veloped, it separates the two Sylvian limbs frciineach other to such an extent that they assume theappearance of the letter U; frontal opercu- REFERENCE HANDBOOK OF THE MEDICAL SCIENCES Brain, Anatomy of lum is less strongly marked, the anterior Sjlvianlimbs may assume a V form or a Y form. In thelatter i-ase, the orbital and fronto-parietal operculameet below the frontal operculum to form the stem human brain. In tlie anthropoid ape they are absent,and, consequently, the fore part of the island ofKeil is exposed on tlie surface of the simian same condition is not at all an uncommon. i orbitalisI triangularis Pars opercularis \Operculum Fig. 9S5.—Lateral View of the Left Cerebral Hemisphere, lUustratiag the Chief Gyriand Sulci. (.Vfter Toldt.) of the Y. In those cases where the frontal operculumis absent altogether, a single anterior limb of theSylvian fissure is the result. The late appearance,the slow growth, the variability of these two operculaand also the tendency to abortive growth or complete occurrence in the brain of the microcephalic are of interest in connectionwith the occurrence of the motor speech centers(Brocas region) in the opercula. In early stages of the de\elopment of the hemi- Sulcus cinguli (pars marginalis)Postlimbic sulcus—.Sulcus subparietalis Fissura calc; Anterior ascending ramus of the paracentral fissure Callosomarginal fissure Sulcus cinguli (pars subfrontalis) Sulcus corpori
Size: 1852px × 1350px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorbuckalbe, bookcentury1900, bookdecade1910, bookyear1913
