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Fig. 231. Section through the facial integument of a three-months fetus

Showing three stages in the early development of hair (Prentiss). X 330.

The first evidence of a hair anlage is the crowding and elongation of a cluster of germinative cells (Fig. 231, A). Their bases sink bud-like into the corium, and active proliferation soon produces a cylindrical epithelial plug (Fig. 231, B , C). This hair anlage consists of an outer wall of columnar cells, continuous with the basal layer of the epidermis, and an internal mass of polyhedral cells. About the whole is a mesenchymal sheath, and at its base the mesenchyme condenses into a mound-like papilla.

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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, April 16) Embryology Arey1924 fig231.jpg. Retrieved from

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