4o8 



INDEX 



Sclerotic layer o£ eye, 383 

 Sclerotome, 111, 284 

 Scrotal area, 227 

 Scrotum, 227 



ligament of, 222 

 Sebaceous gland, 296 

 Sections, chick, fifty hours, 59 

 thirty-eight hours, 47 

 twenty-five hours, 40 



pig, 5 mm., 104 

 10 mm., 125 

 Seessel's pocket, 35, 81, 93, 160 

 Segmental zone, 64 



Segmentation of ovum, 23. See also Cleavage of 

 ovum. 



of vertebrate head, 365 

 Segments, mesodermal, 2, 40, 51, 62, 64 



primitive, 2 

 Semilunar ganglion, 92, 116, 361 



valves, 258 

 Seminal vesicle, 218 

 Sense cells, 387 



organs, chick, 44, 55 

 human, 80, 370 

 Sensory nerves, somatic, 357 



organs, general, 371 

 Septa placenta;, 240 

 Septum, atrial, 251 



interventricular, 121, 258 



median, of adult spinal cord, 324, 325 



membranaceum, 259 



nasal, 313, 373 



pellucidum, 346, 347 



primum, 98, 120, 252, 279 



scroti, 227 



secundum, 121, 253, 279 



spurium, 253 



transversum, 61, 62, 83, 113, 116, 143, 175, 180, 

 182, 183 

 Sertoli, sustentacular cells of, 14, 213 

 Sex cells, 208 



determination of, 22 

 Shaft of hair, 296 

 Sheath cells, 306 



hair, 296 



medullary, 306 



myelin, 306 

 Shoulder-blade, ossification of, 316 

 Sinus, blood, 281 



cavernosus, 273 



cervical, 90, 112 



coronary, 253, 271 



frontal, 376 



marginal, 241 



maxillary, 376 



peripheral, 281 



petrosal, 273 



rhomboidal, 40, 44, SO 



sagittal, superior, 273 



sphenoidal, 376 



transverse, 273 



urogenital, 120, 205, 212 



venosus, 57, 60, 97, 120, 249, 250, 253 

 valves of, 121, 251 

 Sinusoids, 86 



of liver, 57,62, 176,268, 269 

 Situs viscerum inversus, 194 

 Skeletal muscle, striated, 291, 292 



system, 309 • 



Skeleton, 309 



anomalies of, 316 



appendicular, 315 



axial, 309 



branchial arch, 314 

 Skull, 311 



chondrification of, 312 



membrane bones of, 314 



ossification of, 312 

 Smooth muscle, 291 

 Solitary tract, 362 

 Soma, 4 

 Somatic mesoderm, 52, 53, 69 



motor nerves, 360 



sensory nerves, 357 

 Somatopleure, 30, 33, 52, 53, 62, 64 

 Somites, 2 

 Sperm cells, 10 

 Spermatic artery, 267 



cord, 224 



veins, 275 

 Spermatids, 14 

 Spermatocyte, primary, 14 



secondary, 14 

 Spermatogenesis, 14 

 Spermatogonia, 14, 213 

 Spermatozoon, 10 

 Sphenoid bone, ossification of, 313 

 Sphenoidal sinus, 376 

 Spheno-mandibular ligament, 315 

 Spheno-palatine ganglia, 368 

 Sphincter muscle of iris, 383 

 Spina bifida, 352 

 Spinal accessory nerve, 93, 116, 364 



arteries, 264 



cord, 322 

 primitive segments, section through. 111 



ganglia, 50, 116, 304 



supporting cells, 305, 306 



nerves, 116, 353 



efferent or ventral root fibers of, 302 



roots, dorsal, 305 



tract, descending, of trigeminal ner\e, 361 

 Spiral ganglia, 358, 359 



limbus, 387 



organ, 386, 387 



sulcus, 387 



tunnel, 387 

 Spireme, 13 



Splanchnic mesoderm, 53, 69, 169, 366 

 Splanchnopleure, 30, 34, 52, S3, 64 

 Spleen, 191, 281 

 Splenic corpuscles, 282 

 Spongioblasts, 302, 306, 307 

 Spongy layer, 236, 240 

 Stapedial artery, 390 



muscle, 390 

 Stapes, 315, 390 

 Stenson's canal, 148 

 Sternal bars, 311 



Sterno-cleido-mastoid muscle, 364 

 Sternum, 311 



cleft, 316 

 Stoerck's loop, 203 

 Stomach, 81, 96, 119, 169 

 StomodEum, 57, 80, 161 

 Stratified epitheliujn, 294 

 Stratum corneum, 294 



germinativum, 294 



