. The comparative anatomy of the domesticated animals. Veterinary anatomy. THE THOBAX. 465 Independently of these four serous layers, the right pleura furnishes a special membranous fold, which arises from the inferior wall of the thoracic cavity, and ascends to envelop the posterior vena cava. This fold also sustains the right diaphragmatic nerve. In order to study the various portions of the pleurae collectively, with their reciprocal relations, and their connections with the organs contained in the thoracic cavity, we will suppose three transverse sections of this cavity: one passing behind
. The comparative anatomy of the domesticated animals. Veterinary anatomy. THE THOBAX. 465 Independently of these four serous layers, the right pleura furnishes a special membranous fold, which arises from the inferior wall of the thoracic cavity, and ascends to envelop the posterior vena cava. This fold also sustains the right diaphragmatic nerve. In order to study the various portions of the pleurae collectively, with their reciprocal relations, and their connections with the organs contained in the thoracic cavity, we will suppose three transverse sections of this cavity: one passing behind the heart; the other at the roots of the lungs, and dividing the left ventricle of the heart, the third traversing the anterior mediastinum, a little in front of the right ventricle. If, in the first section (Fig. 285), we take the costal pleura at the point a, and follow it up to h, we will see it folded downwards to form the Fig. 235. Fi?. 236. Fig. 237. THEORETICAL SECTIONS OF THE THORACIC CAVITY; INTENDED TO SHOW THE DISPOSITION OF THE PLEURA. mediastinal layer, to be applied to the aorta, c, and the oesophagus, d ; then reflected at e on the lung,/, envelopiug every part of the organ ; returning to the point e, it leaves the lung, is again reflected to achieve the formation of the mediastinal septum, b g, and finally regains the point it started from. On the right side, with only a slight variation, it has the same arrangement. After being carried from the point a' to 6', then to e', and after enveloping the lung, returning to e, and being reflected in the median plane to the pointy',the right pleura leaves the inferior thoracic wall to pass around the posterior vena cava, and come back to a', its point of departure. The second section, (represented by Fig. 236) shows the pleura arrived at the point 6, descending on the root of the lung, c, covering that organ and returning to c, and reflected on the pericardium, d, to gain the point a. In the third section (Fig. 237), we
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectveterinaryanatomy
