. A dictionary of birds . nd lower lobes, as well as to part of the oviduct, after whichit leaves the pelvis together with the ischiadic nerve through theischiadic foramen and ultimately descends the leg, separating into theanterior and posterior tibial arteries. Lastly there are a pair ofarterise pudendse commmies, branches of which supply the lateriventralmuscles of the tail, the CLOACA and copulatory organs, and near theplace where this pair originate arises also the unpaired a. mesentericainferim, which supplies most of the rectum, part of the CiECA and partof the cloacal region—a jjeculia
. A dictionary of birds . nd lower lobes, as well as to part of the oviduct, after whichit leaves the pelvis together with the ischiadic nerve through theischiadic foramen and ultimately descends the leg, separating into theanterior and posterior tibial arteries. Lastly there are a pair ofarterise pudendse commmies, branches of which supply the lateriventralmuscles of the tail, the CLOACA and copulatory organs, and near theplace where this pair originate arises also the unpaired a. mesentericainferim, which supplies most of the rectum, part of the CiECA and partof the cloacal region—a jjeculiar branch, the a. coccygo-mesenterica,being directly connected with a branch of the superior mesentericartery. ii. Venous. It has been already stated (p. 414) that the venousblood is collected and conveyed to the right atrium of the heart by3 great trunks. These are composed as follows :— Each vena cava superior consists of (1) a vena jugularis which,running subcutaneously along the trachea and cesopliagus, collects 64. Diagram of a Birds Vascular System. Ventral two halves of the Heart are drawn as if separate to shew the complete double circulation. and Left Atrium aud Ventricle ; and Right Atrium and Arteries, except the Pulmonary () which is dotted, are shaded :—o(iu, arcus VASCULAR SYSTEM ion the blood from the head and neck ; (2) a vena vertebralis whichdrains the brain, anastomoses by numerous and wide branches withthe cephalic portions of the jugulars and, being lodged in the trans-verse foramina of the cervical vertebrae, which it also drains, runsalong the neck; and (3) a vena subdavia which receives the bloodfrom the thorax, beside a vena humeralis, v. radialis and v. ulnaris,combining to form the v. brachialis, and this again unites with thesubcutaneous ulnar vein of the wing as the v. axillaris. The vena cava inferior receives the blood from all the rest of thebody with its viscera, entering the heart as an
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Keywords: ., bookauthorlyde, bookcentury1800, bookdecade1890, booksubjectbirds
