. Quain's elements of anatomy . nearlytmiform light crimson brown appearance, and is soft and easily laceratedin directions vertical to the surface. The medullary portion of thekidney is more dense than the cortical, and is distinctly striated, owingto its consisting of small diverging uriniferous tubes, and to its blood-vessels l)eing arranged in a similar manner. There are generally morethan twelve pyramids, but their number is inconstant, varying from eightito eighteen. Towards the papillae the pyramids are of a lighter colourthan the cortical substance, but at their base they are usually p
. Quain's elements of anatomy . nearlytmiform light crimson brown appearance, and is soft and easily laceratedin directions vertical to the surface. The medullary portion of thekidney is more dense than the cortical, and is distinctly striated, owingto its consisting of small diverging uriniferous tubes, and to its blood-vessels l)eing arranged in a similar manner. There are generally morethan twelve pyramids, but their number is inconstant, varying from eightito eighteen. Towards the papillae the pyramids are of a lighter colourthan the cortical substance, but at their base they are usually purplishand darker. Excretory apparatus.—On squeezing a fresh kidney which hasbeen split open, a Httle urine wih be seen to drain from the papillae byfine orifices on their surface. The secretion is carried away and con-veyed into the bladder by the ureter. This long tube on being tracedup to the kidney is seen to be someAvhat enlarged, and then to expandas it enters the fissure, into a large funnel-shaped dilatation named the. PELVIS AXD CALICES. 651 pelvis (fig. 546, P). This ^vithin the sinus, divides usually into three,but sometimes only two primary tubular divisions, and these at lengthend in a larger number of short, truncated but comparatively widebranches named calices or infundibula, which receive the papilla intotheir wide mouths and are attached around the bases of those prominencesfrom which, of course, they catch the issuing urine. Fig. 564.—Cast of the ixterior of the upper END OF THE TBETER (Heille). P, ])elvis ; U, ureter. Fig. 564.
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