iSlS.J IN THE CAVA AND JUGULAR VEINS. 405 



sent off to the right, which empties into the internal jugular 

 vein just behind the clavicle. This trunk is concealed 

 in the drawings by the clavicle. A vein of considerable 

 size, marked 10, passes off from each side of the fork^ 

 and runs parallel with the clavicle to the inferior parts of 

 the neck and to the shoulder. 



In both drawings a dilatation of the abdominal ve- 

 na cava and of the emulgent veins is very perceptible. 

 This, I presume, arose from disease, as those parts were 

 not subjected to greater violence in the injecting than 

 others. 



This subject was about seven years old at the time of 

 death. He died of a dysentery; the veins of the mesen* 

 tery were unusually distended with blood. 



Anomalous distributions of the smaller arteries and 

 veins frequently occur, particularly those of the upper 

 extremity; but this case is an exceedingly rare one, as 

 regards the course of the ascending cava. It commonly 

 happens w^hen any of the great vascular trunks are mis- 

 placed, that the unfortunate subject of it dies in a very 

 short time after birth, or else lingers out a miserable ex- 

 istence for a few years to fall at last a victim. In this 

 instance we have cause to admire an arrangement which, 

 though unusual, was nevertheless perfectly adapted to 

 the operations of life, and to the vicarious discharge of the 

 functions of the vena azygos. 



EXPLANATION OF THE PLATE. 



Fig. 1. Side view. 



A. Arm and scapula. 



B. B. Ribs. 



