Anus of horse, 371
of ox, 400
Aorta, 535
abdominal, 536
branches of, 566
of dog, 638
anterior, 537
arch of, 535
of ox, 609
of pig, 627
thoracic, 536
branches of, 565
Aortic orifice of heart of horse, 533
plexus, 712
Aperture, anterior, of thoracic cavity, 450
of abdominal cavity, 353
pharyngeal, of horse, 447