The _radial artery_ (Fig. 67, No. 4) passes downward on the outer rim of the forearm. It continues down to the carpal region, where it supplies the muscles and the skin of the carpal region it gives off the recurrent radial, which passes on the middle finger and finally anastomoses with the collateral radialis artery. The _ulnar artery_ (Fig. 68, No. 6 and 9) passes downward on the inner surface of the ulna to the carpal region where it gives off a branch to the wing plexus and divides into two branches, the smaller branch supplying the thumb (Fig. 68, No. 7). This branch passes down the radial side of the middle finger to the last joint of the second finger. The larger (Fig. 68, No. 8) lies between the second and the third finger bones, and passes through a slit between these two bones to the flexor side of the hand and extends to the last finger-joint, supplying the structures in the region. The ulnar artery gives off a small arterial twig to the papilla of each large wing feather (Fig. 67, No. 6). The _recurrent ulnar_ passes backward to the olecranon of the ulna and supplies the muscles, the skin, the feathers, and other structures of the region, and terminates in end collateral ulnar branches (Fig. 67, No. 5). BRANCHES OF THE POSTERIOR AORTA[7] ( Esophageal ( Intercostales ( Dorsal ( Lumbars ( Spermatics ( Renals ( Ovarian ( Celiac ( Recurrent esophageal ( axis ( Recurrent intestinalis ( Recurrent ilio-colicus ( ( Posterior or recurrent sinister ( Renalis ( ( Anterior or recurrent dexter ( Splenics ( ( ( Hepatic ( ( Hepatica dextra ( Gastric ( Posterior ( Sacralis media ( Coccygeæ laterales aorta ( ( Coccygea media ( Coccygeæ laterales ( ( Anterior mesenteric ( Recurrent ilio-celiacus ( ( Recurrent superior hemorrhoidal ( Posterior mesenteric ( Median hemorrhoidal ( ( Recurrent renalis ( ( Tibialis postica ( Ischiadica ( Tibialis antica ( Peroneal ( Anterior tibial plexus ( ( Arteria ovarialis ( Pudenda communis ( Renalis ( ( Hemorrhoidalis intima ( ( Pudenda externa ( ( Crural ( Internal pelvic (umbilical) ( (External iliac) ( Circumflex femoris ( ( Femoralis Footnote 7: Nomenclature used by Bronn.