5 6 4 



INDEX 



profundus, 449, 462, 463; oph- 

 thalmicus superficialis V, 44; 

 ophthalmicus superficialis VII, 

 448; opticus, 443, 444; palatinus, 

 449; palatinus major, 450, 

 456; patheticus (v. trochlearis) 

 peripheral, 434, 437; petrosus 

 profundus major, 456; petrosus 

 profundus minor, 456; petrosus 

 superficialis major, 450, 456; pe- 

 trosus superficialis minor, 456; 

 plexus, 196, 197; plexus brachi- 

 alis, 438, 439-441; plexus lumbo- 

 sacralis, 438; plexuses, of sym- 

 pathetic system, 464; pneumo- 

 gastric (v. vagus) ; posttrematici, 

 454, 462, praetrematici, 454, 462; 

 sensory, 434; spinal accessory 

 (v. accessorius) ; spino-occipi- 

 tal, 444; stapedialis, 451; sym- 

 pathetic plexuses, 464; sympa- 

 thetic system, 451, 463, 464; ter- 

 minalis, 445; trifacial (v. trig- 

 eminus) ; trigeminus, 247, 248, 

 443, 447, 448-452, 461, 495 ; troch- 

 learis, 216, 443, 445, 446, 447, 

 449, 462; tympanic, 451, 454, 

 456; vagus, 247, 443, 452-457, 

 461 



nerves, motor, 434 



nerves, peripheral, 434, 437 



nerves, sensory, 434 



nerve supply to muscles, 438 



nervous system : anlage of, 62 ; 

 origin of, 406, 407 



neosternum, 138 



neostoma, 154, 424 



nephridia, 366, 368, 370, 371, 381, 

 382, 383 



nephrostomes, 366, 373, 374, 382, 

 383 



neural arches, 126, 508 



neural processes, 126 



neural spine, 508, 510 



neural tube, 62, 406; development 

 of, 407, 408; early history of, 

 406, 407 



neurapophyses, 508, 510 



neurenteric canal, 258 



neurilemma, 434 



newt, 313 



nictitating membrane, 504 



nipples, 115-118; morphology of, 



115; rudimentary, 117 

 noduli lymphatici aggregati, 362, 



363 



Nomarthra, 37 



nose, cartilages of external, 151 



nose, external, 151, 484 



notochord (see under skeletal ele- 

 ments) 



notochord : of Amphioxus, 123, 

 527; of Balanoglossus, 535; of 

 tunicates, 531 



nucleus, 3 



O 



obturator foramen, 172 



occipital condyles, 133 



odontoblasts, 273 



odontoid process of axis, 133 



oesophagus, 290 



Oken, Lorenz, his theories, 506 



olfactory buds, 485 



olfactory lobes, 416, 445 



olfactory nerve, 416 



olfactory pit of Amphioxus, 445 



olfactory surface, increase of, 479, 



482 



omasus, 292 

 omentum, 293 

 ontogenesis, 15 

 ontogenesis, laws of, 20-25 

 oogonium, 55, 56, 57 

 open type of circulation, 317 

 operculum, of ear, 493 

 operculum, of gills, 157, 306 

 Ophidia, 32 

 opossum, 33, 276 

 optic cup, 422, 423 

 optic lobes, 411, 425 

 optic stalks, 445 

 optic vesicle, 422, 423 

 optici thalami, 425 

 opisthocoelous vertebrae, 131 

 orang-utan, 45 

 orbital glands, 286 

 organs of Corti, 492 

 organs of Giraldes, 392 

 organ of hearing, 485-497 

 organ of Rosenmiiller, 391 

 origin, of a muscle, 195 

 Ornithorhynchus, 33, 90, 432 

 Orthagoriscus, 430, 431 



