Part 267

Omental cavity of horse, 380

Omentum, gastro-colic, 358 gastro-hepatic, 354, 358 gastro-splenic, 354, 358, 379 great, of horse, 354, 358 of ox, 396 lesser, of ox, 396

Omo-hyoideus muscle, 224, 226 of ox, 298 of pig, 312

Omo-transversarius muscle of dog, 319 of ox, 302 of pig, 312, 314

Ophthalmic artery, 553 of dog, 635 of ox, 612 nerve, 678 of dog, 728 vein, 590

Optic axis, 740 chiasm, 666 commissure, 666 foramen, 50, 51, 67, 70 groove of horse, 50 nerve of horse, 676 papilla, 745 of ox, 774 of pig, 778 recess, 667 thalamus, 664 tract, 664, 666 of ox, 716

Ora serrata, 745

Orbicular muscles, 211

Orbicularis oculi muscle, 218 of ox, 296 oris muscle of dog, 318 of horse, 213 of ox, 295 of pig, 311

Orbit of horse, 67

Orbital artery, 555 ducts of dog, 427 fascia of horse, 738 fissure of horse, 51 foramen, internal, 67, 70 gland of dog, 427 region of horse, 67 veins of ox, 621 wings of horse, 51

Organ of Corti, 760 of Jacobson, 772 of sense, 734 vomero-nasal, of horse, 440

Orifice, aortic, of heart, 533 atrio-ventricular, left, of ventricle, 530, 533 right, of ventricle, 530, 531 cæco-colic, of horse, 364 fronto-maxillary, 73 ileo-cæcal, of horse, 364 laryngeal, of horse, 348 of anterior vena cava of horse, 529 of coronary sinus, 529 of posterior vena cava, 529 omaso-abomasal, of ox, 396 preputial, of horse, 496

Orifice, pulmonary, of right ventricle, 531 reticulo-omasal, of ox, 394 rumino-reticular, of ox, 393 ureteral, of horse, 477 urethral, external, of cow, 519 of horse, 499 of mare, 515 of ox, 503 internal, of horse, 477 of male horse, 499 of pig, 505

Os coronæ of horse, 89 coxæ, 29 of horse, 92 of pig, 148 pedis of dog, 506 of horse, 90 rostri of pig, 143, 464 suffraginis of horse, 89 uteri externum of mare, 513 internum of mare, 513

Ossa cordis of ox, 609

Osseous labyrinth, 758

Ossicles, auditory, 754

Ossification, 22 endochondral, 22 intramembranous, 22 of vertebræ, 25

Osteoblasts, 22

Osteoclasts, 22

Osteogenesis, 22

Osteology, 19

Ostium abdominale of mare, 511 uterinum of mare, 511

Otic ganglion, 681, 711 of ox, 717

Outlet of pelvis, 97, 354

Ova of mare, 510

Oval notch of horse, 51