Archive image from page 204 of The dairyman's manual; a practical. The dairyman's manual; a practical treatise on the dairy dairymansmanualp00stew Year: 1888 MILK. 199 anofher and about a tenth of an inch apart. They are lined with a fine and highly sensitive membrane which is continuous with the skin. The teat varies in form with use and is subject to considerable alteration by manipu- lation ; it is composed of longitudinal fibers which at the [end are capable of a sort of erection under the influence of stimulus, and thus act as a sphincter to close the ori- fice and prevent the constant
Archive image from page 204 of The dairyman's manual; a practical. The dairyman's manual; a practical treatise on the dairy dairymansmanualp00stew Year: 1888 MILK. 199 anofher and about a tenth of an inch apart. They are lined with a fine and highly sensitive membrane which is continuous with the skin. The teat varies in form with use and is subject to considerable alteration by manipu- lation ; it is composed of longitudinal fibers which at the [end are capable of a sort of erection under the influence of stimulus, and thus act as a sphincter to close the ori- fice and prevent the constant and passive flow of milk. The udder (or udders, there being really four of them in the cow) is made up, in addition to the organs de- scribed above, of connective tissue, arteries, veins, ca- pillary vessels, nerves and absoi'beots. It is supplied with blood by the external pudic artery and requires two sets of veins to com- plete the circulation, one deep, which follows the ar- teries, and one superficial, which converges into the great abdominal vein which passes from the udder near the skin and enters the ab- domen behind the umbilli- cal region. This large vein is commonly called the milk is rightly supposed i to indicate by its prominence the larger milking capacity of the cow. When gestation is not going on the above described glandular culs-des-sacs and tissue connected with them are shrunken and contracted (figure 23, a), the lining membrane is shriveled and folded upon itself and cov- ered only by contracted epithelium. When gestation has progressed to a certain stage the vesicles are enlarged and new ones are developed, the epithelium expands, be- comes globular in shape, and is charged with fat granules,
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