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The thin wall of the capillaries within each capsule separates the blood from the cavity of the tubule. The blood-pressure on the delicate capillary walls causes the exudation of the watery portions of the blood through the cell walls into the capsule. The epithelial cell membrane allows the water of the blood with certain salts in solution to pass, but rejects the albumen.
The ovaries, two in number, are situated one on each side of the uterus. The uterus, which is pear-shaped, with the apex downwards, has three openings, one at the apex and one at each side at the upper part. These two upper openings are provided with a tubule extension, the Fallopian tubes, whose outer ends are fringed and lie in close relation to the ovaries.
After passing a distance many times greater than from the surface to the center of the kidney, the tubule empties its contents into the expanded portion of the ureter. Outer portion or cortex. 2. Medullary portion. 3. Pyramids. 4. Pelvis. 5. Ureter. A. Small section enlarged to show the tubules and their connection with the capsules.
Branch from renal vein. 3. Small artery branches, one of which enters a Malpighian capsule . 6. Small vein leaving the capsule and branching into the capillaries which surround the uriniferous tubules. 4. Small veins which receive blood from the second set of capillaries. 8. Tubule showing lining of secreting cells.
From the capsule the tubule extends toward the concave side of the kidney and, after uniting with similar tubules from other parts, finally terminates at the pyramid. Between its origin and termination, however, are several convolutions and one or more loops or turns.
Like tic-douloureux, its sensation is a curiously fluctuating one, as if pain had been fluidized and poured in trickling streams through the tubules of nerve tissue which are affected by it; but, unlike that, it affects every tubule in the human body not a single diseased locality.
Small artery entering capsule and forming cluster of capillaries within. e. Small vein leaving capsule and branching into c, a second set of capillaries, h. Beginning of uriniferous tubule. The uriniferous tubules are lined with secreting cells. These differ greatly at different places, but they all rest upon a basement membrane and are well supplied with capillaries. Branch from renal artery. 2.
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