. The anatomy of the frog. Frogs -- Anatomy; Amphibians -- Anatomy. Transverse section through tlie hinder portion of the cere- bral hemispheres ; from Stieda. f Lateral ventricle. c' Coninuin ventricle of Stieda. d Longitudinal fibres. / Anterior prolonga- tion of the third ventricle. a common cavity [Ventricidus coitninum lohorum heniisjjJiaericoriim, Stieda). In g"eneral terms, eacli ventricle may be said to be a semilunar cavity, prolong-ed backwards and forwards (Fig-. 107 c); the outer wall is always more or less concave, while the inner varies according- to the part of the hemi- sp
. The anatomy of the frog. Frogs -- Anatomy; Amphibians -- Anatomy. Transverse section through tlie hinder portion of the cere- bral hemispheres ; from Stieda. f Lateral ventricle. c' Coninuin ventricle of Stieda. d Longitudinal fibres. / Anterior prolonga- tion of the third ventricle. a common cavity [Ventricidus coitninum lohorum heniisjjJiaericoriim, Stieda). In g"eneral terms, eacli ventricle may be said to be a semilunar cavity, prolong-ed backwards and forwards (Fig-. 107 c); the outer wall is always more or less concave, while the inner varies according- to the part of the hemi- sphere examined. At the anterior and j^osterior extremities the inner wall is convex and bulg-es into the cavity (Fig". 107) ; in the middle portion of the cavity the inner wall presents a longi- tudinal groove ( Veutrlcidl lateralis cormi inter- num, Reissner), (Fig. 108 ^/), and consequently the inner wall has here two rounded masses, an upper and a lower {Corjms striatum^ Wiedersheim), projecting into it. By tracing them backwards and forwards, the lower swelling is seen to in- crease at the expense of the upper, while at the same time the lateral grooves disapj^ear; the outline of the cavity shown in Fig. 107 is then obtained. The roof of the ventricle is arched and broader than the floor, which, in the middle part, exists only as a vertical slit (Fig. 108), [Ventriculi lateralis cornu ivferius, Reissner): towards the anterior and posterior extremities it widens and becomes shallower (Fig. 107). The cerebral hemispheres and olfactory lobes are composed of a fine granular matrix, enclosing- spindle-shaped, rounded, or pear-shajîed nerve cells and nuclei, and containing very fine fibres. The cells (Fig. 109 li) are more numerous towards the ventricle, and somewhat sparse towards the superficial sm'face. The cells are of two chief sizes, the smaller and more numerous average 0*004 nim. to O'OoS mm. in diameter ; they are found chiefly in the deeper portions of the section,
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