76 



CUTIS. 



[sect 36. 



Fig. 33. 



palm, 8 1 compound or 150 to 200 smaller papilla; Meissner, xx^ou 

 the palmar surface of the finger, 400), and arranged partly regu- 

 larly in two chief series (fig. 33), 

 each of which contains from 2 to 5 

 papilla abreast, seated upon linear 

 elevations — -^ to ± of a line broad, 

 and 2 L to j of a line high — the 

 ridges of the corium, whose course, 

 as they are visible externally on the 

 epidermis, does not require further 

 description. In other places the 

 papillae are less regularly distributed ; 

 either very near to each other, as on 

 y the labia minora, the clitoris, the 

 penis, and the nipple, or more scat- 

 tered, as on the limbs (except the 

 parts of them above mentioned) — 

 on the scrotum, neck, chest, abdo- 

 and back. The size of the 

 papilla varies pretty considerably, 



J- to 



Horizontal section of the skin of the lieel men, 

 through the apices of the papillae of one entire 

 and two half ridges, a. Horny layer of epi- 

 dermis between the ridges ; b. stratum Mal- 



pighii of the epidermis ;c. papillae ;d. stratum and IS, Upon an average, from 

 Malpighii between the papillae, belonging to -. e ' f mi i .,, 



their common base; e. sweat canals. Magni- 0*3 01 a line. liie longest papilla 

 tied 60 diameters. 



are to be found on the sole of the 

 foot, the palm of the hand, the nipple, the bed of the nails, and 

 on the labia minora. Their breadth is generally f to \ of their 

 length. 



The thickness of the cerium varies from \ to i^ line, and in 

 most places amounts to a \ or g of a line. It presents most of 

 the chemical characters of connective tissue, of which chiefly it is 

 composed. It has little tendency to putrify, and none at all when 

 treated with vegetable matters containing tannic acid, by which it 

 is tanned or converted into leather. By boiling in water, it is 

 resolved into gelatin. 



§ 36. The cutis consists principally of connective and elastic 

 tissue, and contains, besides, smooth muscles, fat-cells, blood-vessels, 

 and lymphatics in large quantity. 



The connective tissue consists of the usual bundles, which are 

 partly connected in the form of a network, as in the subcutaneous 

 cellular tissue; partly in the form of larger secondary bundles, 

 trabecules and lamince of various kinds. In the pannicnlus adi- 

 posus there are between these numerous larger and smaller spaces 



