198 



TEXT-BOOK OF EMBRYOLOGY. 



The Appendicular Skeleton. 



The growth of the limb buds and their differentiation into arm, forearm 

 and hand, thigh, leg and foot, along with the rotation which they undergo during 

 development, have been discussed in the chapter on the external form of the 

 body (p. 149). The metameric origin of the muscles of the extremities is 



