232 



ANATOMY OF THE DOMESTIC FOWL 



the lateral rim of the latter muscle it gives oflF the arteria hemorrhoid- 

 alis intima. This artery passes to the bursa of Fabricius and to the 

 end of the cloaca. It enters into the ischio-coccygeus muscle, and 

 divides into the arteria pudenda externa, and in ducks, the arteria 

 profunda penis. These branches supply the vas deferens, the ureter, 

 the cloaca, the penile structure, and the muscles of these parts. 



Fig. 70. — Blood-vessels of a Cornish cock i, The left pulmonary artery. 

 2, Right pulmonary artery. 3, Left brachio-cephalic artery. 4, Left subclavian 

 artery. 5, Left carotid artery. 6, Right brachio-cephalic artery. 7, Posterior 

 aorta. 8, Posterior vena cava. 9, Left pulmonary vein. 10, Right ptilmonary 

 vein. II, Celiac axis. 12, Anterior mesenteric artery. 13, Ischiadic artery. 

 14, Crop. 15, Superior artery of the crop and vein of same name. 16, Testicular 

 or ovarian artery. 17, External iliac artery. 18, Intercostal nerve, ig, Median 

 sacral artery. 20, Arteria ^judenda communis. 21, Anus. 22, Vena hypo- 

 gastrica. 23, Right vena hepatica magna. 24, Left vena hepatica magna. 25, 

 Vena iliaca interna. 26, Vena iliaca communis. 27, Vena iliaca externa. 28, 

 Vena coccygo-mesenterica. 29, Vena umbilicalis. 30, Vena supra-renalis. 31, 

 Origin of the pars renalis. 32, Lumbar veins. 33, Vena epigastrica. 34, 

 Lumbales (arteries). 35, Anterior division of the lumbo-sacral plexus. 36, 



Posterior division of the lumbo-sacral plexus. 

 38, Right anterior vena cava. 



37, Left anterior vena cava. 



The Sacralis Media. — The median coccygeal artery (Fig. 70, 

 No. 19) forms the single extension of the sacralis media. It gives 

 off lateral branches between the caudal vertebrae which supply the 

 dorsal muscles of that region and the skin. The third pair are the 

 largest. These are the arterim coccygecB laterales, and are located 

 on the dorsal side of the tail, they supply the tail glands and 

 rudder feathers, the main tail feathers, or rectrices. A small 

 arterial twig is given off to the papilla of each rectrix. ' 



