. The mammary apparatus of the mammalia : in the light of ontogenesis and phylogenesis . Mammals; Mammary glands. 128 MAMMARY APPARATUS OF THE MAMMALIA separate from the larger ones jo and a, and gradu- ally shift ventrallj. But whereas p and a at once develop into typical knob-shaped primordia, 77 and a behave quite differently. These, in fact, become elongated epithelial cylinders growing into the cutis, and gradually assume the form of well-marked hair primordia, con- nected with special nerves and bloodvessels. ai. Fig. 45d.—Nipple Development of "Sciueus vul- ; Embryo No.
. The mammary apparatus of the mammalia : in the light of ontogenesis and phylogenesis . Mammals; Mammary glands. 128 MAMMARY APPARATUS OF THE MAMMALIA separate from the larger ones jo and a, and gradu- ally shift ventrallj. But whereas p and a at once develop into typical knob-shaped primordia, 77 and a behave quite differently. These, in fact, become elongated epithelial cylinders growing into the cutis, and gradually assume the form of well-marked hair primordia, con- nected with special nerves and bloodvessels. ai. Fig. 45d.—Nipple Development of "Sciueus vul- ; Embryo No. 6. Transverse Section (Diagrammatic) through the Primordia. a^ and a, First abdominal and smaller abdominal primary nipple primordia; big, bloodvessel; n, nerve. Thus each of these primordia produces a strong vibrissa (Fig. 46). Such vibrissge are of course well known on the head and the extremities, but here in the squirrel we find them also on the abdomen to the number of at least four in correspondence with their origin from the two anterior pairs of nipple primordia. Further it is extremely interesting that the accessory. 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 Bresslau, E. (Ernst), 1877-; Hill, James Peter, 1873-1954. London : Methuen & Co.
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Keywords: ., bookcentury1900, bookdecade1920, booksu, booksubjectmammaryglands
