File:Arey1924 fig235.jpg

Fig. 235. Sections representing three stages in the development of the human mammary gland

(Tourneux)

A, Two months; B, four months; C, seven months.

Each human mammary gland begins as a thickening and downgrowth from the epidermal milk line in the region of the future breast (Fig. 235). During the fifth month, from 15 to 20 solid cords bud off {B). These anlages of the milk ducts branch in the mesenchymal tissue of the corium, hollow out, and eventually produce the alveolar oid pieces (C). Where the milk ducts open on the surface the epidermis is elevated to form the nipple, but this may be delayed until after birth. The glands yield a little secretion ( - witch milk - ) at birth; they enlarge rapidly at puberty and are further augmented during pregnancy, while two or three days after parturition they become functionally active.

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Pages where the terms "Historic" (textbooks, papers, people, recommendations) appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms, interpretations and recommendations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)

Developmental Anatomy 1924: 1 The Germ Cells and Fertilization | 2 Cleavage and the Origin of the Germ Layers | 3 Implantation and Fetal Membranes | 4 Age, Body Form and Growth Changes | 5 The Digestive System | 6 The Respiratory System | 7 The Mesenteries and Coelom | 8 The Urogenital System | 9 The Vascular System | 10 The Skeletal System | 11 The Muscular System | 12 The Integumentary System | 13 The Central Nervous System | 14 The Peripheral Nervous System | 15 The Sense Organs | C16 The Study of Chick Embryos | 17 The Study of Pig Embryos | Figures

Reference

Arey LB. Developmental Anatomy. (1924) W.B. Saunders Company, Philadelphia.

Cite this page: Hill, M.A. (2024, April 27) Embryology Arey1924 fig235.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Arey1924_fig235.jpg

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