. L'anatomie du corps humain. L'anatomie humaine ; l'anatomie. 412 SPLANCHNOLOGY.. Fig. Entre eux, 170. et, étant sur- arrondi de tous les côtés par adhe- sions, qui évide le, pour ainsi dire, d'une cavité pour elle-même, au détriment de la surface des lobes, et simule ainsi un abcès du poumon. Il y a beaucoup de variétés dans l'arrangement de ces lobes. Ainsi, parfois, les fissures, et plus particulièrement celles liées au lobe, n'atteignent pas jusqu'à la racine des poumons, mais ne sont qu'un peu indiqué. Trois lobes ne sont pas rare dans le poumon gauche, ou dans les quatre

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. The anatomy of the human body. Human anatomy; Anatomy. 412 SPLANCHNOLOGY.. Fig. 170. tween them, and, being sur- rounded on all sides by adhe- sions, it hollows out, as it were, a cavity for itself, at the expense of the corresponding surfaces of the lobes, and thus simulates an abscess of the lung. There are many varieties in the arrangement of these lobes. Thus, sometimes, the fissures, and more especially those which bound the middle lobe, do not reach as far as the root of the lungs, but are only slightly indicated. Three lobes are not unfrequently found in the left lung, or four in the right; there were four lobes in the lung of a negro l^-y lately presented to the ana- tomical society. Examples are on record of lungs with five, six, and even seven lobes, but in general this multiplicity of lobes is only rudimentary, and represents the normal condition in the majority of animals. The dog, the sheep, and the ox have seven lobes in their lungs Inner or Mediastinal Surface —This corresponds to the mediastinum {f p). On it we observe the root (r) of the lungs, that is, the part at which they communicate with the trachea, through the bronchi, and receive and emit their bloodvessels. This root oc- cupies a very limited space upon the inner surface, one inch in height, and half an inch in breadth ; it is situated at the junction of the posterior with the two anterior thirds of this surface, at an almost equal distance from the apex and the base. That part of the inner surface of the lung which is behind the root corresponds to the vertebral column and the posterior mediastinum, in which are found, on the left side, the descending aorta and the upper part of the thoracic duct; and on the right side, the vena azygos, the oesophagus, and the lower part of the thoracic duct. All that portion of the inner surface which is in front of the root corresponds with the anterior mediastinum, and is excavated to receive the heart {I); and as the heart projects more to the left

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