. The mammary apparatus of the mammalia : in the light of ontogenesis and phylogenesis . Mammals; Mammary glands. 28 MAMMARY APPARATUS OF THE MAMMALIA these hair primordia, which are crowded to- gether and are sometimes concentrically arranged, is over 100 for each primary- primordium, so that they are henceforward characterized by an unusual wealth of hairs, in contradistinction to their former baldness. The significance of these formations comes out more distinctly still in the following stages, ^i^. Fig. 12a.—Echidna : Transverse Section through THE Incubatorial Area OF Semon's Embryo, Stag
. The mammary apparatus of the mammalia : in the light of ontogenesis and phylogenesis . Mammals; Mammary glands. 28 MAMMARY APPARATUS OF THE MAMMALIA these hair primordia, which are crowded to- gether and are sometimes concentrically arranged, is over 100 for each primary- primordium, so that they are henceforward characterized by an unusual wealth of hairs, in contradistinction to their former baldness. The significance of these formations comes out more distinctly still in the following stages, ^i^. Fig. 12a.—Echidna : Transverse Section through THE Incubatorial Area OF Semon's Embryo, Stage 51. Dr, Gland area ; ?ia, hair bud ; hm, skin-muscle; sdr, sweat gland. Avhen the hair follicles begin to produce glands. The glandular outgrowths, which appear in the neighbourhood of the primary-primordia, slowly develop into typical sweat glands, the histogenesis of which Eggeliug has described in detail. But the glandular outgrowths which arise from the hair follicles in the region of the primary-primordia develop only in their first stages after the manner of sweat glands, and. 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
