L'anatomie humaine, y compris la structure et le développement et des considérations pratiques . rmation du diaphragme, il se sépare de ce dernier et [)rojectsinto le corps-cavité. Cette projection entraîne une différenciation de l'ventralmesentery en trois parties : (a) la partie médiane, les couches de qui becomeseparated par le foie de plus en plus pour former son investissement séreuse ; (A) la partie antérieure, qui s'étend de la surface avant du foie à l'ombilic et devient le ligament thefalciform entourant la veine ombilicale, plus tard le ligamentum teres ; (c) partie theposterior b, qui s'étend

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Human anatomy, including structure and development and practical considerations . rmation of the diaphragm, it separates from the latter and [)rojectsinto the body-cavity. This projection results in a differentiation of the ventralmesentery into three parts : (a) the middle portion, the layers of which becomeseparated by the growing liver to form its serous investment; (A) the anterior portion, which extends from the front surface of the liver to the umbilicus and becomes thefalciform ligament enclosing the umbilical vein, later the ligamentum teres ; (c) theposterior portion, which stretches between the digestive tube and the liver and, asthe gastro-hepatic, or lesser omentum, maintains similar relations and encloses thebiliary ducts. In the foetus the liver is relatively immense, especially at an early period. Atthe fourth foetal month it practically fills the whole of the top of the abdomen.Although it increases absolutely after this, it relatively diminishes, but at birth is stillconsiderably above the relative size of the adult organ, forming approximately one-. 1726 HUMAN ANATOMY. eighteenth of the entire body vveiijjlu. The left lol^e reaches across the stomach soas to be in contact with the spleen. The tubercle at the lower extremity of theSpigelian lobe and the caudate lobe are relatively large. In the infant there is littleconnective tissue in the organ, which is very friable and also easily moulded on thesurrountling structures. At birth the weight of the liver is about 150 gm. (3 oz.). PRACTICAL CONSIDKRATIONS: Till-: LIKR, GALL-HLADDER, AND BILIARY PASSAGES. The Liver.—Anomalies in the position of the liver occasionally occur, as intransposition, when the whole organ may be on the left side ; in such cases thespleen and other asymmetrical abdominal viscera (and frequently, but not neces-sarily, the thoracic organs) will also be found to be transposed. Accessory lobesare not uncommon and have been mistaken for new growths. The shape of the liver may obv

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