LIMBS 



419 



and hind-limbs end in claws. An animal such as man, who places 

 the sole of the foot on the ground, is called plantigrade. 



The skin, which is described in more detail in Chapter 26, is 

 covered with a stratified epidermis. There are no scales, but 



UPPER ARM (BRACHIUm ) 



humerus 



FOREARM ( ANTEBRACHIUm ) 



radius 

 ulna — 



WRIST (carpus) 

 proximal carpals 



central carpals 



di^sjtal carpals 



HAND fMANUS ) 

 metacarpals 



THIGH (femur ) 

 femur 



SHANK fCRUS) 

 tibia 



fibula 



postaxial 

 or outer 



ANKLE ( TARSUS ) 

 proximal tarsals 



central tarsals 

 distal tarsals 



FOOT (pes) 



metatarsals 



phalanges 



alanges 



Fig. 331. — A diagram of a pentadactyl limb (cheiropterygium). Names of the 

 fore-limb on the left, of the hind-limb on the right. Metacarpals and meta- 

 tarsals are together called metapodials. 



cellular outgrowths of the epidermis form hairs, which are 

 peculiar to the Mammalia. The skin also contains sweat or sudor- 

 ific glands and grease or sebaceous glands which secrete an oily 

 substance into the hair follicles. 



INTERNAL STRUCTURE 



The muscles of the adult rabbit show little trace of the 

 segmentation which they have in the early stages of development. 



