478 THE TISSUES. 



points (compound papillae, Fig. 319). They are very numerous on 

 the palm of the hand and the sole of the foot, and are situated upon 



Fig. 318. Fig. 319. 



Fig. 318. Papillae of the palm, the cuticle being detached. (Magnified 35 diameters.) 



Fig. 319. Compound papillae of the surface of the hand with two, three, and four subdivisions. 



a. Base of a papilla. b, b. Their separate processes, c, c. Processes of papillae whose base is not 



visible. Magnified 60 diameters. (Knitter.) 



ridges visible to the naked eye. E. H. Weber found upon the vola 

 manus, on a surface 1 line square, 81 compound, or 150 to 200 

 smaller papillae, disposed with tolerable regularity in two principal 

 series, each having two to five papillae in the transverse direction ; 

 placed on linear elevations T J to -%-$ of an inch broad by ^-^ to ^ 

 of an inch high the ridges of the corium. 



Elsewhere, the papilla are more irregularly scattered, either very 

 closely together, as in the labia minora, the clitoris, the penis, and 

 the nipple, or somewhat more widely apart, as on the extremities 

 (except the places above named), on the scrotum, the neck, chest, 

 abdomen, and back. 



The size of the papillae varies much. The shortest (^^ to ^-^ 

 of an inch), occur on the face ; and next (^^ to T Jo of an inch), on 

 the female breast, the scrotum, and at the root of the penis. In 

 most other situations, they are 564 to 3 g of an inch long. The 

 longest (g|o to 2^TF f an inch), are found on the palm of the hand, 

 the sole of the foot, the nipple (where they are generally of the 

 compound kind), the anterior and posterior extremities of the bed 

 of the nail ( T J 5 to T |^ of an inch), and the labia minora ( 2 J<i to 

 yj^ of an inch). The diameter of the papillae at the base gene- 

 rally equals, or is somewhat less than the length. In the shortest, 

 above-mentioned, it exceeds the length by J or more; and hence 

 they resemble warts or even short ridges. In the largest papillae 

 the breadth is j- to J the length. 



The distribution of the bloodvessels and nerves in the papillae 

 will be described on page 483. 



