. Milk. Milk. 46 MILK the same side of the cow, but no milk can appear in a left quarter from a right quarter. The udder is a spongy organ consisting of skin, muscle, nerves, veins, arteries, lymphatics, milk-ducts, secreting glands, and fibrous fatty and connective tissue (Fig. 11). The size of the fully developed udder is 24 to 54 by 16 to 32 by 10 to 20 cm. The outer skin of the udder is soft and -thin and is supported by fibrous tissue. It is covered with hair which is softer than the hair of the coat of the animal. The udder swells considerably when milk is accumulating and contracts whil
. Milk. Milk. 46 MILK the same side of the cow, but no milk can appear in a left quarter from a right quarter. The udder is a spongy organ consisting of skin, muscle, nerves, veins, arteries, lymphatics, milk-ducts, secreting glands, and fibrous fatty and connective tissue (Fig. 11). The size of the fully developed udder is 24 to 54 by 16 to 32 by 10 to 20 cm. The outer skin of the udder is soft and -thin and is supported by fibrous tissue. It is covered with hair which is softer than the hair of the coat of the animal. The udder swells considerably when milk is accumulating and contracts while milk is Fig. 12.—A plaster-of-Paris cast of the interior of the teat and milk cistern of one quarter of an udder (Moore and Ward). The degree of contraction varies, and is particularly small when the udder contains much fatty tissue. At the lower extremity of the udder are the teats, which are tube-like appendages, and are 6 to 10 cm. long. There is one teat for each quarter of the udder (Fig. 12). A sphincter muscle, located at the end of the teat, keeps the milk from flowing from the udder until it is relaxed by sucking or milking. The cow has no voluntary control over this muscle. Sometmies, however, the muscle is weak and milk leaks from the udder under the press- ure of the accumulating secretion. On the other hand, the muscle is occasionally so tight that a smooth, wooden wedge has to be. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Heinemann, Paul Gustav. Philadelphia and London, W. B. Saunders Company
Size: 1296px × 1929px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorheineman, bookcentury1900, bookdecade1910, bookyear1919
