Cortical lamination and localisation in the brain of the marmoset / by F.W. Mott, E. Schuster and W.D. Halliburton.

  • Mott, F. W. (Frederick Walker), 1853-1926.
Date:
[1909]
Catalogue details

Licence: In copyright

Credit: Cortical lamination and localisation in the brain of the marmoset / by F.W. Mott, E. Schuster and W.D. Halliburton. Source: Wellcome Collection.

Provider: This material has been provided by King’s College London. The original may be consulted at King’s College London.

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    temporal lobe a comparative poverty of cells is noticeable, both in the pyramidal and granule layers. Posteriorly the pyramids are smaller and more crowded, and in both regions the large pyramids are greatly diminished in size. Visual Area. Extent and Boundaries.—The visual area covers the posterior pole of the hemisphere. It extends forward on the external surface for about 3 or 4 mm., and on the mesial surface to about halfway between the pole and the corpus callosum, as shown in fig. 1. Characteristics.—The depth of the cortex is about V5 mm., the molecular layer measuring about 0T mm., the pyramidal layer about 06 mm., the granule layer 03 mm., the line of Gennari OT mm., and the polymorph layer 03 to 04 mm. The pyramidal cells are rather smaller than those of the motor and temporal types, and more numerous, and the granules also are smaller and more crowded. Large solitary cells of Meynert, measuring about 20 /a by 15 fi, are scattered above and below the granules. In the Lemur the visual cortex is more shallow, and the individual cells are smaller and more closely crowded together. Archipallium. Olfactory Area. Extent and Boundaries.—The olfactory area lies on the under side of the anterior portion of the temporal lobe, the rhinal fissure forming its inferior and anterior, and the hippocampal fissure its superior boundary. Posteriorly it extends to about the level of the extremity of the rhinal fissure. Characteristics.—This cortex measures about 1 mm. in depth, the mole- cular layer measuring about 02 mm., the pyramidal layer about 04 mm., the pallid zone about OT mm., and the polymorph layer 03 to 04 mm. Thus, though the cortex as a whole, and the pyramidal layer particularly, are more shallow than in the neopallium, the molecular layer is deeper. A line of characteristic cells lies at the top of the pyramidal layer, larger than the adjacent pyramids, they are more closely crowded together, and form a characteristic darkly staining line under a low power of the microscope. They are angular, and generally quadrilateral in shape, and have several clearly staining branched processes, of which two generally pass upwards into the molecular layer. The pyramidal cells as a whole are comparatively large, though they are not numerous; but there is no line of specially large supra- or infra-granular pyramids. Scattered granules are seen among the pyramids, but do not form a distinct granule layer. A conspicuous pallid zone lies below the pyramids. The polymorph layer is composed of blunt roundish cells, similar to those found in the limbic area. Limbic Area. Extent and Boundaries.—The limbic area covers the portion