. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. 134 COMPARATIVE ANATOMY. A series of unpaired ventricles, lying in the longitudinal axis of the brain, as well as paired ventricles can always be distinguished. The principal paired cavities lie within the cerebral hemispheres, and are known as the lateral ventricles (Ventricnlus 1 and 2) (Fig. 107, SV); each of these communicates with the unpaired sys- tem by means of an opening, the foramen of Monro (Fig. 107, FM~). In Teleostei, certain Amphibia, and Sauropsida, each optic lobe also contains
. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. 134 COMPARATIVE ANATOMY. A series of unpaired ventricles, lying in the longitudinal axis of the brain, as well as paired ventricles can always be distinguished. The principal paired cavities lie within the cerebral hemispheres, and are known as the lateral ventricles (Ventricnlus 1 and 2) (Fig. 107, SV); each of these communicates with the unpaired sys- tem by means of an opening, the foramen of Monro (Fig. 107, FM~). In Teleostei, certain Amphibia, and Sauropsida, each optic lobe also contains an optic ventricle, communicating with the unpaired system of ventricles. The latter consists of a third (within the thalamencephalon) and a fourth ventricle (in the medulla oblongata), as well as of the aqueduct of Sylvius,. FIG. 107.—DIAGRAM OF THE VENTRICLES OF THE VERTEBRATE BRAIN. Vff, cerebral hemispheres, containing the lateral ventricles (>S7*) ; ZR, thalamen- cephalon, with the third ventricle (III); in Mammals the paired septum lucidum, lying anteriorly to the thalamencephalon, encloses the "fifth ventricle " ; each lateral ventricle communicates with the third ventricle by a small aperture, the foramen of Monro (FM) ; A/77, mid-brain, which encloses the aqueduct of Sylvius (Aq], communicating between the third and fourth ventricles ; HR, cerebellum ; Nff, medulla oblongata, enclosing the fourth ventricle (//") ; Cc, central canal of the spinal cord (R], ^ which passes through the mid-brain and connects these two. For further details, such as the relations of the different ventricles to particular parts of the brain, compare Figs. 106 and 107. A so- called fifth ventricle, lying between corpus callosum and fornix, is found in Mammals, but morphologically it is quite different from the others. All five cerebral vesicles lie at first in the same horizontal plane, but in the course of development the axis of the vesicles be- comes bent downwards, so t
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