. Anatomy, descriptive and surgical. oose tissue and fat removed fromaround the vessels and the excretory duct (). It will be then seen that the kidney con-sists of a central cavity surrounded at all partsbut one by the proper kidney-substance. Thiscentral cavity is called the sinus, and is lined bya prolongation of the fibrous coat of the kidney,which enters through a longitudinal fissure, thehilum (before mentioned), which is situated atthat part of the cavity which is not surroundedby kidney-structure. Through this fissure theblood-vessels of the kidney and its excretory ductpass, an
. Anatomy, descriptive and surgical. oose tissue and fat removed fromaround the vessels and the excretory duct (). It will be then seen that the kidney con-sists of a central cavity surrounded at all partsbut one by the proper kidney-substance. Thiscentral cavity is called the sinus, and is lined bya prolongation of the fibrous coat of the kidney,which enters through a longitudinal fissure, thehilum (before mentioned), which is situated atthat part of the cavity which is not surroundedby kidney-structure. Through this fissure theblood-vessels of the kidney and its excretory ductpass, and therefore these structures upon enteringthe kidney are contained within the sinus. Theexcretory duct or ureter after entering dilates intoa wide, funnel-shaped sac named the pelvis. Thisdivides into two or three tubular divisions, which again divide into several short,truncated branches named calices or infundibula, all of which are contained in thecentral cavity of the kidney. The blood-vessels of the kidney after passing through. Vertical Section of Kidney. 946 THE URINARY ORGANS. Fig. 626. the hilum are contained in the sinus or central cavity, lying between its lining mem-brane and the excretory apparatus, before entering the kidney-substance. This central cavity, as before mentioned, is surrounded on all sides, except atthe hilum, by the substance of the kidney, which is at once seen to consist of twoparts—viz. of an external, granular, investing part, which is called the cortical por-tion; and of an internal part, the medullary portion, made up of a number of dark-colored pyramidal masses, with their bases resting on the cortical part and theirapices converging toward the centre, where they form prominent papillae which pro-ject into the interior of the calices. The cortical substance is of a bright reddish-brown color, soft, granular, andeasily lacerable. It is found everywhere immediately beneath the capsule, and isseen to extend itself in an arched form over the ba
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