Henry L. Bruner 2 
Or 
termination of the latter in the vena cava anterior. Through the larger 
part of its course the vena jugularis externa is a subcutaneous vein, re- 
ceiving numerous small tributaries from the skin. 
On account of its relation to the vena mandibularis externa, the vena 
jugularis externa is placed in indirect communication with the vena 
Fic. 3. Vena trachealis, vena jugularis interna and related veins of a late 
embryo of Lacerta agilis (head 5.7 mm.). X 10. 
c. p., posterior anastomosis between the vena mandibularis interna, and 
vena mandibularis externa; s. a., sinus articularis; s. d., sinus dentalis; v. D., 
vena bucealis; v. b. m., vena bucco-mandibularis; v. c. s., vena cava superior; 
v. 7. €., vena jugularis externa; v. j. 7. d., vena jugularis interna dextra; v. j. 
i. S., vena jugularis interna sinistra; v. 1. d., vena lingualis dorsalis; v. 1. v., 
vena lingualis ventralis; v. m., vena mandibularis; v. m. c., vena mandibulo- 
cerebralis; v. m. e., vena mandibularis externa; v. m. i. d., vena mandibularis 
interna dorsalis; v. m. i. v., vena mandibularis interna ventralis; v. sc., vena 
subclavia; v. t., vena trachealis; v. ¢. a., vena tympanica anterior; v. ft. d., 
vena trachealis dextra; v. t. s., vena trachealis sinistra. 
In this stage the dorsal and ventral parts of the vena mandibularis interna 
are not connected anteriorly. 
mandibularis interna and other deep veins, which may, therefore, find an 
outlet through the external jugular vein. Posteriorly the vena jugularis 
externa receives a cutaneous vein, which arises dorsal to the shoulder 
