470 



INDEX 



Primordial cranium, development of, 



428 

 Primordial follicle, 27 

 Proamnion, 86, 138 

 Procoracoid, 435 

 Proctodseum, 170, 314, 319 

 Pronephros, 190-193 

 Pronucleus male and female, 34, 36 

 Prosencephalon, lOS, 149 

 Proventriculus, 313 

 Pubis, 438, 439 

 Pulmo-enteric recesses (see pneu- 



mato-) 

 Pulmonary arteries, 359 

 Pupil of eye, 166, 272 



Radius, 436 



Ramus communicans, 254, 257, 259 



Recapitulation theory, 3; diagram 

 of, 5 



Recessus hepatico-entericus, 343 ; re- 

 cessus mesenterico-eutericus, 343; 

 recessus opticus, 153; recessus 

 pleuro-peritoneales, 340 ; recessus 

 pulmo-tiepatici, 340; recessus su- 

 perior sacci omenti, 340 



Rectum, 317 



Renal corpuscles, 378, 383 



Renal portal circulation, 369, 372, 

 375 



Renal veins, 372 



Reproduction, development of or- 

 gans of, 390-403 



Respiratory tract, 178, 325 



Rete testis, 398 



Retina, 274, 275 



Retinal zone of optic cup, 271 



Rhombencephalon, 108, 155 



Ribs, development of, 424, 425 



s (abbreviation for somites), 67 



Sacrum, 424 



Sacculus, 293, 294 



Saccus endolymphaticus, 169, 289, 

 290 



Saccus infundibuli, 249 



Scapula, 434, 435 



Sclerotic coat of eye, 279 



Sclerotomes, and vertebral segmenta- 

 tion, 412; components of, 412; oc- 

 cipital, 428; origin of, 185, 186 



Seessell's pocket, 174 



Segmental arteries, 122, 199, 362 



Segmentation cavity, 43, 47, 53 (see 

 also subgerminal cavity) 



Semeniferous tubules, 398 



Semicircular canals, 291 



Semi-lunar valves, 352 



Sensory areas of auditory labyrinth, 

 origin of, 296 



Septa of heart, completion of, 355, 

 356, 357 



Septal gland of nose, 287 



Septum aortico-pulmonale, 351, 352; 

 of auricular canal, 355; bulbo- 

 auricular, 353; cushion, 351, 355; 

 interaurioular, 351, 354; interven- 

 tricular, 351, 353, 354; of sinus 

 venosus, 358 



Septum transversum, 208, 209, 334; 

 derivatives of, 339; lateral closing 

 folds of, 334, 337 ; median mass of, 

 335 



Septum trunci et bulbi arteriosi, 351 



Sero-amniotic connection, 138, 143, 

 217 



Sexual cords, 393, 394; of ovary, 398; 

 of testis, 395 



Sexual differentiation, 394, 395 



Sheath cells, 255 



Shell, structure of, 17 



Shell membrane, 18 



Sickle (of Roller), 71 



Sina-auricular aperture, 357, 358 



Sinu-auricular valves, 358 



Sinus terminalis 86 (see also vena 

 terminalis) 



Sinus venosus, 197, 200, 201, 357; 

 horns of, 358; relation to septum 

 transversum, 339 



Skeleton, general statement con- 

 cerning origin, 407 



Skull, chondrification of, 429-432; de- 

 velopment of, 427; ossification of, 

 432, 433, 434 



Somatopleure, 62, 115 



Somite, first, position in embryo. 111 



Somites, of the head, 114; meso- 

 blastic, origin of, 110, 111; meso- 

 blastic, metameric value of, 184; 

 primary structure of, 114 



Spermatid, 13 



Spermatocyte, 13 



Spermatogenesis, 12 



Spermatogonia, 13 



Spermatozoa, period of life within 

 oviduct, 35 



Spermatozoon, 9 



Spina iliaca, 440 



Spinal accessory nerve, 269 



Spinal cord, development of, 239 



Spinal nerves, components of, 254; 

 development of, 252, 255; somatic 

 components of, 254; splanchnic 

 components of, 256 



Splanchnocranium, 427 



Splanchnopleure, 62, 115 



Spleen, 345-347 



Spongy layer of shell, 17 



Stapes, 300 



