. The comparative anatomy of the domesticated animals. Veterinary anatomy. 676 TEE CENTRAL AXIS OF glands: small appended lobes placed inferior face of the isthmus.' Fig. GENERAL VIEW OF THE BRAIN ; LOWER SURFACE. 1, Olfactory lobe; 2, Cavity of the olfactory lobe; 3, External root of olfactory lobe; 4, 5, Cerebral hemispheres; 6, Cerebellum ; 7, Optic chiasma, or commissure; 8, Pitui- tary gland; 9, Optic nerves; 10, Tuber cinereum; 11, Crus cerebri; 12, Third cranial nerve; 13, Fourth nerve; 14, Pons Varolii; 15, Fifth nei-ve ; 16, Sixth nerve ; 17, Seventh and eighth nerves; 18, Me- d
. The comparative anatomy of the domesticated animals. Veterinary anatomy. 676 TEE CENTRAL AXIS OF glands: small appended lobes placed inferior face of the isthmus.' Fig. GENERAL VIEW OF THE BRAIN ; LOWER SURFACE. 1, Olfactory lobe; 2, Cavity of the olfactory lobe; 3, External root of olfactory lobe; 4, 5, Cerebral hemispheres; 6, Cerebellum ; 7, Optic chiasma, or commissure; 8, Pitui- tary gland; 9, Optic nerves; 10, Tuber cinereum; 11, Crus cerebri; 12, Third cranial nerve; 13, Fourth nerve; 14, Pons Varolii; 15, Fifth nei-ve ; 16, Sixth nerve ; 17, Seventh and eighth nerves; 18, Me- dulla oblongata, the number being placed on the olivary body; 19, Anterior pyramid; 20, Roots of ninth, tenth, and eleventh nerves; 21, Twelfth nerve. TEE NEBVOVS SYSTEM. one on the superior, the other on the Medulla Oblongata. (Figs. 323, 324, 329.) The medulla oblongata constitutes the posterior portion of the encephalic isthmus; it succeeds the spinal cord, and extends forward as far as the pons Varolii. It is a thick peduncle of a white colour, wider before than behind, flattened above and below, and having four facesâ&n inferior, superior, and two lateral. Inferior face (Fig. 322).âThis face rests in the channel of the basilar process. Convex from side to side, and limited anteriorly by a transverse fissure which separates it from the pons Varolii, posteriorly it does not offer anything to distinguish it from the medullary axis. On the middle line there is a well- â marked fissure, a continuation of the inferior fissure of the cord, which lies between two very elongated promi- nences that are sometimes but little apparent, and from their form are named ^epyramids of the bulb (corpora pyramidalia) (Figs. 322, 19; 338, b). The base of these pyramids touches the pons Varolii, and theif apex is insensibly lost, posteriorly, on reach- ing the spinal cord. Outwardly is an almost plane sur- face, bordered anteriorly by a trans- verse band which lies immediately behind the p
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