File:Arey1924 fig234.jpg

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Fig. 234. Human embryo of 13.5 mm with a prominent milk line

(after Kollman). X 5.

Mammary glands are peculiar to mammals. In embryos of about 9 mm. paired ectodermal thickenings extend lengthwise between the bases of the limb buds (Fig. 234). This linear ridge is the milk line. In man it often is inconspicuous except in the pectoral region, but in lower mammals, like the pig, that have serially repeated glands, a prominent thickening reaches from axilla to groin (Fig. 389).

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   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 Leslie Arey.jpg


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

Cite this page: Hill, M.A. (2024, February 28) Embryology Arey1924 fig234.jpg. Retrieved from

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