File:Arey1924 fig233.jpg

Fig. 233. Vertical sections of the integument

Illustrating four stages in the development of a sweat gland (adapted from Kollman). A, B, Four months; C, D, seven months.

Sudoriferous glands begin to develop in the fourth month from the epidermis of the finger tips, the palms of the hands, and the soles of the feet. They are formed as solid downgrowths from the epidermis, but differ from hair anlages in being more compact and in lacking the mesenchymal papillie at their bases (Fig. 233, A, B). During the sixth month the simple cords coil, and, in the seventh month, their lumina appear (Fig. 233, C, D). The inner layer of eells forms the gland cells, while the outer cells become transformed into smooth muscle fibers, which, accordingly, are ectodermal. In the axilla, eyelids, and external acoustic meatus the sweat glands are large and branched.

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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

Reference

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

Cite this page: Hill, M.A. (2024, April 27) Embryology Arey1924 fig233.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Arey1924_fig233.jpg

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