. The anatomy of the frog. Frogs -- Anatomy; Amphibians -- Anatomy. 388 THE SKIN AND THE SENSE-OEGANS. Fis-. 241. processes vary considerably in length, according to the position of the body (o'03-o*o5 mm.). The central processes vary from 0'02- 0*03 mm. in length. The peripheral processes are considerably thicker than the central processes. No mewhrana limitans olfactoria has been discovered in the frog. (2) The second layer consists of a network of processes belong- to the bases of the central processes of the superimposed epithelial and olfactory cells. Numerous highly refractive nuclei pos
. The anatomy of the frog. Frogs -- Anatomy; Amphibians -- Anatomy. 388 THE SKIN AND THE SENSE-OEGANS. Fis-. 241. processes vary considerably in length, according to the position of the body (o'03-o*o5 mm.). The central processes vary from 0'02- 0*03 mm. in length. The peripheral processes are considerably thicker than the central processes. No mewhrana limitans olfactoria has been discovered in the frog. (2) The second layer consists of a network of processes belong- to the bases of the central processes of the superimposed epithelial and olfactory cells. Numerous highly refractive nuclei possessing nucleoli are situated in the meshes of this network ; they correspond in all particulars with the nuclei of the olfactory cells (M. Schultze). According to Exner the branched processes of the epithelial cells and of the olfactory cells unite to form a complex plexus. Other observers, Paschutin, Cissoif, v. Brunn, Schultze, and Hoffmann oj)pose this view, and hold that the central processes of the olfactory cells do not unite with the processes of the epithelial cells, but that they are in direct continuity with the fibrils of the olfactory nerve. This view is probably correct. The submucous layer has a loose con- nective-tissue matrix, w^hich encloses the glands, nerves, and vessels; according to Paschutin two pigment-layers may be distinguished : the one, immediately under the middle layer of this mucous membrane, is continuous and deeply pig- mented; the second is deeper and does not form a continuous layer. This layer is extremely rich in blood-vessels and lymphatics (Langer * and Paschutin), (Fig. 240 II). The lymphatics are rela- tively very large and are very nimtierous (Langer). In this layer the central processes of the olfactory cells form bundles of fibres, lying parallel with the surface of the mucous mem- brane (Paschutin, Cissoff, and Schultze).]. Separations from the olfactory mu- cous membrane of Rana temporaria ; after C. K. Hoffmann, I. Surface view of
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