. The anatomy of the human body. Human anatomy; Anatomy. 362 SPLANCHNOLOGY. absence of any real line of separation between the duodenum and the rest of the small intestine, and of their similarity in structure and function. The small intestine is divided into three parts, the duodenum, the jejunum, and the ileum. The division between the duodenum and the rest of the small intestine is defi- nite, but that between the jejunum and the ileum is altogether arbitrary; so that we shall follow the example of Haller, Soemmering, and others, in describing the jejunum and ileum together (c to d), under
. The anatomy of the human body. Human anatomy; Anatomy. 362 SPLANCHNOLOGY. absence of any real line of separation between the duodenum and the rest of the small intestine, and of their similarity in structure and function. The small intestine is divided into three parts, the duodenum, the jejunum, and the ileum. The division between the duodenum and the rest of the small intestine is defi- nite, but that between the jejunum and the ileum is altogether arbitrary; so that we shall follow the example of Haller, Soemmering, and others, in describing the jejunum and ileum together (c to d), under the name of the small intestine, properly so called. The Duodenum. Dissection.—When the abdomen is opened, the first portion only of this intestine is visible ; the second is hid by the ascending colon ; the third is seen in the cavity of the omentum. The second is brought into view by turning aside the colon. The third por- tion, which is the most difficult to demonstrate, may be exposed in two ways : either by cutting through the inferior layer of the transverse mesocolon, or by turning the stomach upward, after having divided the lavers of the grest omentum, which are attached along its greater curvature. Fig. 154. The duodenum {dudeKa duKTvXov, p h, Jig. 154), so called by Herophilus (Ga- len, Admmislr. Anat., lib. vi., c. 9) on account of its being about equal in length to the breadth of twelve fin- gers, commences at the py- lorus, and terminates, with- out any precise line of de- marcation, to the left of the second lumbar vertebra, at the point where the small intestine enters into the mesentery, or, rather, op- posite the superior mesen- teric artery (m) and vein, which pass in front of it. Its fixed position, its struc- ture, and its curvatures, have led to its being de- scribed separately * It IS difficult to determine its precise situation with regard to the abdominal parietes. It is not exclusivel}- confined to any one region, but occupies in succession the adjac
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