336 



HISTORY OF THE HUMAN BODY 



FIG. 93. Development of arterial arches in Rat embryo. [After 

 TANDLER.] 



I, II, III, . IV, V, VI, represent the respective arches or their rudiments; a, 

 conus arteriosus; ad, dorsal aorta; av, ventral aorta (truncus arteriosus) ; ccb, art. 

 carotis cerebralis; p, arteria pulmonalis; ec, first cervical artery; s, segmental arteries, 

 hy, hypoglossal artery; ms, maxillary artery; md, mandibular artery; o, supra- 

 orbital artery; i, infra-orbital artery; /, lingual artery; vc, art. vertebralis cere- 

 bralis; x, y, stumps which ultimately join, and form the stapedial artery, (st.) 



