Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: The cortical portion of the hair is composed of flat fusiform epithelial scales. The center or medullary portion consists of embryonic corpuscles, which are quite often pigmentated, that gives shade or color to the hair; it is closely connected with the amount of pigmentation in the skin. Gray and blonde hair has very little pigment. The hair follicle in which the root is imbedded is a pouch- like connective tissue structure consisting of three layers, the external, middle and internal. It consists of connective tissue containing an artery, vein, and nerve. Nails.?Are also modifications of the epidermis, differing from it by being harder and firmer. They are horny, elastic, translucent plates, embedded in the skin and attached to the dorsum of the phalanges. They have four borders, the anterior being free, the posterior and lateral, slightly curved longitudinally in their natural state, convex on their upper surface, but in latent syphilitic patients they are spoon shaped, and flattened, very thin, having lost their natural curve. Nails are supposed to be a modified portion of the Stratum Lucidum, beginning its function in the third month of intra-urine life, and by the eighth month a greater part has developed. PHYSIOLOGY OF THE SKIN. An organ like the skin, of such complex and wonderful structure, could not possess a less wonderful and complex function; usually the work of the internal organs is confined to one or two functions, but in the skin we find its functions are more varied and more numerous than that of any other organ in the body; therefore, a study of its function is of even greater importance to the physician than its anatomy, who especially should be familiar withthose internal disturbances of the life force that so frequently present themselves upon the...
- J. Henry Allen
- Met illustraties
- 5x152x229 mm
- 270,00 gram
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