File:Arey1924 fig231.jpg

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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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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 Leslie Arey.jpg

Reference

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


Cite this page: Hill, M.A. (2024, February 22) Embryology Arey1924 fig231.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Arey1924_fig231.jpg

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