. The anatomy of the domestic animals. Veterinary anatomy. THE BRAIN 771 The ninth or glosso-pharyngeal, the tenth or vagus, and the eleventh or spinal accessory nerves are connected lay a linear series of roots with the lateral aspect of the ventral surface of the medulla. The spinal part- of the accessorj^ nerve comes forward along the edge of the medulla to join its medullary root. The twelfth or hypoglossal nerve arises from the posterior part of the medulla along the lateral edge of the pyramid. The parts that are visible when the brain is viewed from above are the cerebral hemispheres, t
. The anatomy of the domestic animals. Veterinary anatomy. THE BRAIN 771 The ninth or glosso-pharyngeal, the tenth or vagus, and the eleventh or spinal accessory nerves are connected lay a linear series of roots with the lateral aspect of the ventral surface of the medulla. The spinal part- of the accessorj^ nerve comes forward along the edge of the medulla to join its medullary root. The twelfth or hypoglossal nerve arises from the posterior part of the medulla along the lateral edge of the pyramid. The parts that are visible when the brain is viewed from above are the cerebral hemispheres, the cerebellum, and part of the medulla oblongata. The cerebral hemispheres (HemisphEeria cerebri) form an ovoid mass, and are separated from each other by the median longitudinal fissure (Fissura longitudinalis cerebri), Liiiigiliiiliniil fixxiirc Trigemimil ncriv Sulcus rhinalis'^^ Optic nerve ^ Optic chiasma^^^ Tuber ciuereum -^^ Piriform lobe — Pituitary body Oridomotor neriv nsory root motor root CerclxUum ~^ Tubcrciilum faciale Glosso-pharyngeal ner Vagus ner re Accessory nerve {medullary root Fig. 630.— D VI, Abducent. Accessory nerve {spinal root) -' Hypoglossal nerve Olfactory bulb ^^-^ Olfactory trad -- Medial stria , Lateral stria — Trigonum olfactorium ~-Fossa lateralis Cerebral peduncle Tract us ped. transversiis - Interpeduncular fossa - Pons '?— Corpus trapezoidcum Pyramid Medulla oblongata ~"~~~ Chorioid plexus of fourth ventricle Median fissure and de- cussation of pyramids Spinal cord Fig. 629.) in which the falx cerebri is situated. Their surfaces are marked by thick ridges, the gyri cerebri, separated by sulci. The upturned ends of the olfactory bulbs are seen in front of the frontal poles of the hemispheres. The occipital poles of the hemispheres overlie the anterior part of the cerebellum, from which they are separated by the transverse fissure (Fissura transversa cerebri) and the tentorimn cerebelli contained in it. The cerebellum is a mu
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