ANATOMY OF A MONODACTYLOUS P^OETUS 413 



The median cephalic {M. C. V.) runs vertically upward on the 

 ventral surface of the postaxial part of the brachialis, receiving 

 as it goes the deep cubital vein from the cubital fossa. The 

 median cephalic joins the lower half of the cephalic and the com- 

 mon trunk joins the upper half of the cephalic. 



The median basilic runs (M. B. V.) back over the medial epi- 

 condyle of the humerus then turns up to join the basilic. It is 

 double in most of its course. 



Deep veins {fig. 8) 



The radia and ulnar veins coursing alongside the correspond- 

 ing arteries unite to form the vena comes lying medial to the 

 brachial artery, and passing behind the biceps tendons. 



Another vein runs back alongside the median nerve in front 

 of the biceps tendons and half way from the elbow to the axilla 

 the brachial vein leaves the side of the artery, crosses in front of 

 the median nerve, and unites with the vein accompanying the 

 nerve. This common trunk ascends to the axilla and unites 

 with the basilic to form the axillary. 



The axillary vein lies medial and deep to the ulnar nerve and 

 medial cord of the brachial plexus and receives the usual normal 

 tributaries. 



EMBRYOLOGICAL AND GENERAL CONSIDERATIONS 



The first questions that naturally arise in connection with 

 this case are as to the causative agent and time of production of 

 the monstrous condition here exhibited. There are several dif- 

 ferent possibilities to be considered and as the time and the cause 

 are closely related they will be taken up together. 



This deformity may be hereditary and so transmitted in the 

 germ cells. In the case referred to previously, which was de- 

 scribed by Schultze ('04), there was only one digit on each hand 

 and foot and this same identical condition was found in the 

 mother and the mother's father, while a brother had mono- 

 dactylous hands, and other deformities of the feet. It is a well 

 known fact that monstrosities affecting the limbs show more 



