. The mammary apparatus of the mammalia : in the light of ontogenesis and phylogenesis . Mammals; Mammary glands. THE MILK-STREAK 107 which are not preceded by any primordia cor- responding to the milk-streak. Secondly, it follows that when we trace back the mammary apparatus of the Placentals, we have to com- pare the primary-primordia, not with the milk- lines, but with the milk-streaks. And indeed this comparison presents no Fig. 38.—Human Embryo, showing "Milk-Streak" AND Central Region Becoming Elevated to Form "; (Schmitt.) 11'5 mm. It is clear,
. The mammary apparatus of the mammalia : in the light of ontogenesis and phylogenesis . Mammals; Mammary glands. THE MILK-STREAK 107 which are not preceded by any primordia cor- responding to the milk-streak. Secondly, it follows that when we trace back the mammary apparatus of the Placentals, we have to com- pare the primary-primordia, not with the milk- lines, but with the milk-streaks. And indeed this comparison presents no Fig. 38.—Human Embryo, showing "Milk-Streak" AND Central Region Becoming Elevated to Form "; (Schmitt.) 11'5 mm. It is clear, then, from the above statements that the primary-primordia and the milk-streaks are entirely similar in structure. In both formations we recognize (1) an area of thickened epidermis ; (2) an underlying zone of condensed and richly vascularized cutis. Topographically, also, both harmonize 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
