. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. A portion of a tubule of the testis (Guinea-pig, Co- baya)f magnified 300 diameters. a a, basement membrane ; a, corpuscle in its sub- stance ; b b, epithelium in situ, consisting of par- ticles of different dimensions, with minute gra- nules in their interstices ; c, cavity of the tubule full of detached epithelium particles, of various size and appearance, and mingled with nume- rous seminal animalcules ; d, one of these semi- nal animalcules. even exceeds that amount, its essential charac- ters, however, remaining the
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. A portion of a tubule of the testis (Guinea-pig, Co- baya)f magnified 300 diameters. a a, basement membrane ; a, corpuscle in its sub- stance ; b b, epithelium in situ, consisting of par- ticles of different dimensions, with minute gra- nules in their interstices ; c, cavity of the tubule full of detached epithelium particles, of various size and appearance, and mingled with nume- rous seminal animalcules ; d, one of these semi- nal animalcules. even exceeds that amount, its essential charac- ters, however, remaining the same. In the larger tubes, emerging from the gland, this tunic becomes gradually invested by a delicate fibrous layer, by which the vascular network is attached to it, and which at first sight may. vesicles of the jiancn-us of the dot), magnified 300 diameters. The basement membrane is seen at a a a, where the epithelium has been a little detached. In the salivary and all the allied glands, the basement membrane admits of being easily demonstrated. A very thin slice of the fresh organ should be torn by needles, gently washed, atid inspected under a high power. The termi- nal vesicles of the duct will then be brought into view and their outline seen to be perfectly sharp and linear (fig. 275, a a a). In parts where the epithelium which they contain has been loosened, the basement membrane will be left in relief. It is of extreme delicacy ; and, as in all other situations, its capillary plexus (when well filled with coloured material) may be seen ramifying, not in its substance (for its tenuity renders such a disposition impossible), but on its parenchymal surface. I have sought in vain for the basement mem- brane in the lobules of the liver, and I am in- clined to think that it does not exist in this gland, except in the excretory part of the bile ducts. In the air-cells of the lungs the basement membrane assumes a most interesting and re- markable developement, for it constit
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