. Kirkes' handbook of physiology . e upper part of the ureter, or ductof the organ, is dilated into the pelvis; and this, again, after separating intotwo or three principal divisions, is finally subdivided into 8 to 12 smallerportions, calyces, each of which receives the pointed extremity or papilla ofa pyramid. Sometimes, however, more than one papilla is received by acalyx. The kidney is a compound tubular gland. Both its cortical and ils medul-lary portions are composed essentially of numerous tubes, the tubuli urinijeri, 371 372 EXCRETION which begin at the opening on the Malpighian pyrami
. Kirkes' handbook of physiology . e upper part of the ureter, or ductof the organ, is dilated into the pelvis; and this, again, after separating intotwo or three principal divisions, is finally subdivided into 8 to 12 smallerportions, calyces, each of which receives the pointed extremity or papilla ofa pyramid. Sometimes, however, more than one papilla is received by acalyx. The kidney is a compound tubular gland. Both its cortical and ils medul-lary portions are composed essentially of numerous tubes, the tubuli urinijeri, 371 372 EXCRETION which begin at the opening on the Malpighian pyramid and, after a deviouscourse, end in the capsule of the glomerulus. Tubuli Uriniferi. The tubuli uriniferi, figure 287, are composedof a nearly homogeneous membrane, and are lined internally by vary considerably in size in different parts of their course, but are,on an average, about 40 //. in diameter, and are found to be made up of severaldistinct sections. The first section or part to be identified is the Malpi-. Fig. 286.—Longitudinal Section of Kidney through Hilum. a. Cortical pyramid; b, medullaryray; c, medulla; d, cortex; e, renal calyx; f, hilum; g, ureter; h, renal artery; i, obliquely cut tubulesof medulla; j and k, renal arches; /, column of Bertini; m, connective tissue and fat surroundingrenal vessels; n, medulla cut obliquely; o, papilla; p, medullary pyramid. (Merkel-Henle.) ghian, or Bowmans, capsule, figure 287. It is composed of a hyaline membranapropria, thickened by a varying amount of fibrous tissue, and lined by flattenednucleated epithelial plates. This capsule is the dilated extremity of theuriniferous tubule which is invaginated to receive the glomerulus of con-voluted capillary blood-vessels. The invaginated portion of the tubule is ofparticular importance since it is the membrane through which a large partof the urine is secreted. The glomerulus is connected with an efferent andan afferent blood-vessel. The Malpighian capsule is co
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