. Les animans et l'homme ; un manuel élémentaire de zoologie et de physiologie humaine. s vu d'élargir en acavity (p), le bassin du rein. Depuis le bassin,branches, appelées calices, s'étendre dans la substance rénale.de la partie solide du rein il y a deux couches, thecortex (c) et le bulbe (m). Le bulbe est divisé intopyramids (pyramides de Malpighi) dont les petits bouts (o) aredirected dans le pelvis. L'artère rénale (R. A.) entre dans le rein à l'hile, ordepression sur le côté interne du rein ci-dessous l'uretère,et les branches de la veine rénale (R. V.) laissez-theureter ci-dessus.

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. The animans and man; an elementary textbook of zoology and human physiology. s seen to widen into acavity (p), the pelvis of the kidney. From the pelvis, branches, called calices, extend into the kidney substance.Of the solid part of the kidney there are two layers, thecortex (c) and the medulla (m). The medulla is divided intopyramids (pyramids of Malpighi) whose small ends (o) aredirected into the pelvis. The renal artery (R. A.) enters the kidney at the hilus, ordepression on the inner side of the kidney below the ureter, and the branches of the renal vein (R. V.) leave it above theureter. The pyramids in the medulla are composed of hundreds ofmicroscopic tubules (T). These open by minute pores at RESPIRATION AND EXCRETION the points of the pyramids into the calices of the pelvis.They extend back through the medulla and convoluteor wind about in the cortex. Here they form multitudesof tiny capsules which surround a network of capillaries.The branches of the renal artery pass into the connective tis-sue of the cortex, giving off a few branches to the pyramids.. FIG. 177. Longitudinal section through the kidney, (pelvis and a numberof renal calices). U, ureter; C, cortex; M, medulla; P, pelvis;T, tubules; B, blood vessel (arterial branch); R. V., branch of renalvein; R. A, branch of renal artery. O, O, pyramids. (Tyson afterHenley.) Then a branch enters each tiny capsule where it breaks upinto a little ball of capillaries called a glomerulus. From theglomerulus a tiny vein passes to the tubules and there againbreaks up into capillaries. This network of capillaries finallybecomes the branches of the renal vein. These leave thekidney to carry the blood back again to the heart by wayof the vena cava ascending. 352 THE ANIMALS AND MAN The cells which line the capsules and part of the tubulesare secreting cells (somewhat similar to those of the salivaryglands and of the pancreas). These cells secrete water, in-organic salts and organic wastes (urea, etc.) from the blood

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