Histological and in vivo examinations of skins were made in order to offer one of the grounds of tympanic skin grafting in the following 14 regions: the external auditory canal (cartilagineous portion), the retroauricular region, the upper arm (medial and lateral parts), the forearm (anterior and posterior parts), the thorax, the back, the abdomen (lateral and hypogastric parts), the inguinal region, the gluteal region, and the thigh (medial and lateral parts). Although considerably different in relation to individuals, both the data show some common characteristic trends of skin in different regious of the body surface irrespective of age. The present data were summarized as follows: L Thick skin pieces can be usually r emoved from the g luteal region and the abdomen. 2. The dis tribution of sebaceous glands is relativ el y scarce in the upper and lower extremities. Accordmgly, irrespective of the methods of transplantation, skin pieces removed from both the extremities are of more advantage in preventing them from infection and crust formation. 3. The distribution of sweat glands in skin pieces is almost uniform in the major reg ions ot the body surface. Skin pieces removed by the split thickness graft method are evenly available for tympanic grafting, and thos e from the back and gluteal r egions are of more advantage in preventing them from infection because of the deepest presence of sweat glands ther e. 4. The distribution and thickness of hairs have a rela tion with the success of tympanic skin grafting. Perforation of skin pieces, to be induced by the thin split thickness graft method, is prevented by using the thick split thickness graft method, due to regeneration from the remaining part of the hair roots in the deeper layer of skin pieces. The possibility of development of cholesteatoma f r om hair roots is, however, prevented by using the same skins in the full thickne ss graft method. 5. The ext ension and dis tribution of elastic fibers, especially of deep hori zontal thic k elastic fiber s , has a relation with th e success of tympa nic s kin grafting skin pieces removed from the r etroauricular r egion, the back and the glut eal region are of advantage, because the distribution and extensi on of deep horizontal thick elastic fibers are found far deeper in those regions than anywhere else. 6. Considering from the abovementioned data, it is probable that skin transplants removed f rom the thigh , the back, the g luteal and r etroauricular reg ions are theoretically more avaiabl e a s tympanopl a stic material, although it is difficult to determin e t heir superiority or inferiori t y in detail a s tympanoplast ic material in the skins of th e whole body surfa ce examined.
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