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1. Galactophorous ducts. 2. Lobuli of the mammary gland.

Identifier: treatiseon00play (find matches)
Title: A treatise on the science and practice of midwifery
Year: 1878 (1870s)
Authors: Playfair, W. S. (William Smoult), 1836-1903 Harris, Robert P., (from old catalog) ed
Subjects: Obstetrics
Publisher: Philadelphia, H. C. Lea
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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uscular fibres, chiefly developed near their terminalextremities. They are lined with columnar epithelium, continuouswith that in the acini; and it is by the distension of its cells withfatty matter, and their subsequent bursting, that the milk is formed.Nipple.—The nipple is the conical projection at the summit of themamma, and it varies in size in different women. Not very unfre-quently, from the continuous pressure to which it has been subjectedby the dress, it is so depressed below the surface of the skin as toprevent lactation. It is generally larger in married than in singlewomen, and increases in size during pregnancy. Its surface is coveredwith numerous papillae, giving it a rugous aspect, and at their basesthe orifices of the lactiferous ducts open. Here are also the openingsof numerous sebaceous follicles, which secrete an unctuous materialsupposed to protect and soften the integument during lactation.Beneath the skin are muscular fibres, mixed with connective and Fig. 36.
Text Appearing After Image:
1. Galactophorous ducts. 2. Lobuli of the mammary gland. clastic tissues, vessels,nerves, and lymphatics. When the nipple isirritated it contracts and hardens, and by some this is attributed toits erectile properties. The vascularity, however, is not great, andit contains no true erectile tissue: the hardening is, therefore, dueto muscular contraction. Surrounding the nipple is the areola, of apink color in virgins, becoming dark from the development of pig-ment cells during pregnancy, and always remaining somewhat darkafter childbearing. On its surface are a number of prominent tuber- OVULATION AND MENSTRUATION. 71 cles, sixteen to twenty in number, which, also become largely de-veloped during gestation. They are supposed by some to secretemilk, and to open into the lactiferous tubes; most probably they arecomposed of sebaceous glands only. Beneath the areolar is a circularband of muscular fibres, the object of which is to compress the lactif-erous tubes which run through it, and thu

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