. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. LITERATURE 151 The occurrence of a milk ridge has not yet been observed in a sufficient number of embryos to determine whether it is a normal development or is associated with the formation of supernumerary glands {polymastia). This is by no means an infrequent anomaly; it has been observed in 19 per cent, of over 100,000 soldiers of the German army who were examined, and occurs in 47 per cent, of individuals in certain regions of Germany The extent to which the anomaly is developed varies fr
. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. LITERATURE 151 The occurrence of a milk ridge has not yet been observed in a sufficient number of embryos to determine whether it is a normal development or is associated with the formation of supernumerary glands {polymastia). This is by no means an infrequent anomaly; it has been observed in 19 per cent, of over 100,000 soldiers of the German army who were examined, and occurs in 47 per cent, of individuals in certain regions of Germany The extent to which the anomaly is developed varies from the occurrence of well-developed accessory glands to that of rudimentary accessory nipples {Jiyperihelia), these latter sometimes occurring in the areolar area of a normal gland and being possibly due in such cases to an hypertrophy of one or more of Montgomery's c€; * .-/'-* ., ° '>_, Fig. 90.—Section through the Mammary Gland of an Embryo of 25 cm. 1, Stroma of the gland.—{From Nagel, after Basch.) Although the mammary glands are typically functional only in females in the period immediately succeeding pregnancy, cases are not unknown in which the glands have been well developed and functional in males {gynecomastia). Furthermore, a functional activity of the glands normally occurs immediately after birth, infants of both sexes yielding a few drops of a milky fluid, the so-called witch-milk (Hexenmilch), when the glands are subjected to pressure. LITERATURE. J. T. Bowen: "The Epitrichial Layer of the Human Epidermis," Anat. Anzeiger, rv 1889. Brouha: •'Recherches sur les diverses phases du developpement et de l'activite dela mammelle," Arch, de Biol., xxi, 1905. G. Burckhard: "Ueber embryonale Hypermastie und Hyperthelie," Anat. Hefte viii, 1897. H. Head: "On Disturbances of Sensation with Special Reference to the Pain of Visceral Disease," Brain, xvi, 1892; xvn, 1894; and xix, 1896. E. Kallius: "Ein Fall von Mil
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