. The anatomy of the domestic animals. Veterinary anatomy. THE NERVOUS SYSTEM OF THE DOG 849 The cerebral hemispheres are very broad behind and diminish in width an- teriorly; there is a sudden narrowing at the frontal poles, which are flattened laterally. The tentorial surfaces are concave and form a deep cavity which re- ceives the anterior part of the cerebellum. The arrangement of the fissures and gyri is simpler than in the animals previously examined. The chief fissures arc as follows: 1. The lateral fissure extends upward and backward from the sulcus rhinalis a little behind the middle
. The anatomy of the domestic animals. Veterinary anatomy. THE NERVOUS SYSTEM OF THE DOG 849 The cerebral hemispheres are very broad behind and diminish in width an- teriorly; there is a sudden narrowing at the frontal poles, which are flattened laterally. The tentorial surfaces are concave and form a deep cavity which re- ceives the anterior part of the cerebellum. The arrangement of the fissures and gyri is simpler than in the animals previously examined. The chief fissures arc as follows: 1. The lateral fissure extends upward and backward from the sulcus rhinalis a little behind the middle of the lateral siu-face of the hemisphere. 2. The ectosylvian fissure has approximately the shape of an inverted U, and curves over the lateral fissm'e. It is regarded as consisting of three parts—anterior, middle, and posterior (F. ectosylvia anterior, media, posterior). 3. The suprasylvian fissure Ues above and approximately concentric with the preceding. It also consists of three parts—anterior, middle, and posterior. 4. The ectomarginal or collateral fissure runs forward on the dorsal aspect of the hemi- sphere almost parallel with the dorso-medial bor- der. A little in front of tlie middle of the surface it gives off a short ansate fissure (F. ansata) which runs obliquely mediaDy and forward. It is usually continued anteriorly by the coronal fissure, and may be in contmuity posteriorly with the medilateral (or post-liHeral) fissure. Longitudinal Jist:ure Olfactory bulb Frontal pole. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Sisson, Septimus, 1865-1924. Philadelphia, London, W. B. Saunders Company
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