. The comparative anatomy of the domesticated animals. Veterinary anatomy. THE (ESOPHAGUS. 449 canal to dilate. It adheres but loosely to the muscular coat, on which it can glide with the greatest facility. It has a thick, resisting, stratified, tesselated epithelium, an unstriped muscular layer, and some racemose glands. (A third or middle coat is sometimes mentioned by anatomists ; it is com- posed of the tissue connecting the latter tunic with the one to be next described.) The muscular coat commences at the-posterior part of the pharynx by the ari/teno-ossophageal and superior longitudinal
. The comparative anatomy of the domesticated animals. Veterinary anatomy. THE (ESOPHAGUS. 449 canal to dilate. It adheres but loosely to the muscular coat, on which it can glide with the greatest facility. It has a thick, resisting, stratified, tesselated epithelium, an unstriped muscular layer, and some racemose glands. (A third or middle coat is sometimes mentioned by anatomists ; it is com- posed of the tissue connecting the latter tunic with the one to be next described.) The muscular coat commences at the-posterior part of the pharynx by the ari/teno-ossophageal and superior longitudinal casophageal muscles (Fig. 251). The aryteno-msophageal muscle is an extremely thin, small band in Solipeds, situated on the posterior border of the arytenoid cartilage, at the commencement of the (esophagus, where its fibres disappear. To expose this muscle—which represents the inferior longitudinal oesophageal of some authorities, the oesophagus should be turned forwards on the upper surface of the pharynx. The superior longitudiiial m^ophageal muscle is a small superficial band, the Fig PECTORAL CAVITY AND MEDIASTINUM, SHOWING THE COURSE OF THE TRACHEA AND (ESOPHAGUS. A, Anterior mediastinum; B, posterior mediastinum; c, the heart and pericardium part of the mediastinum; d, diaphragm; E, trachea; F, oesophagus. the middle fibres of which leave the base of the fibrous triangle that occupies the posterior face of the pharynx, to disappear on the surface of the oesophagus, where some of them form loops at different elevations. To these muscles at the commencement of the oesophagus, must be added the crico-obsofhagecd, which leaves the deep face of the crico-pharyngeus to pass to the border of the oesophagus, where its fibres proceed above and below that tube, in joining those of the muscle of the opposite side. This muscle compresses the oesophagus at its commencement, in the same way as Wilson's muscle acts upon the urethra. The remainder of this muscular tunic is form
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