642 



INDEX 



Somatic receptors, 479 



(peripheral) neurones, 426, 479, 481 

 Somatochromes, 133 

 Spaces of Fontana, 560 

 Special denial germs, 243 



senses, 442 

 Spermatids, 343 

 Spermatoblast, 351 

 Spermatocytes, 343, 350 

 Spermatogenesis, 350 



technic of, 353 

 Spermatogones, 342 

 Spermatozoa, 59, 343, 349 

 acrosome, 350 

 anterior end-knob, 350 

 apical body, 350 

 axial thread, 350 

 development of, 59, 350 

 diagram of, 349 

 galea capitis, 350 

 perforatorium, 350 

 posterior end-knob, 350 

 structure of, 59, 350 

 technic of, 352 

 Sphenopalatine ganglion, 442 

 Sphincter pylori, 259 

 Spider cells, 147 



Spinal accessory nerve, see Nerves, cranial 

 Spinal cord, 422, 448 



anterior columns of, 454 

 funiculus, 454 

 horns of, 450, 454 

 marginal bundle of Lowenthal, 472 

 median fissure, 454 

 pyramids, 471 

 white commissure of, 456 

 antero-lateral columns of, 454 

 funiculus, 454 

 white column, 454 

 arachnoid membrane of, 428 

 arrangement of fibres of, 458 

 arteries of, 460 

 ascending tracts of, 467 

 axonal method of determining fibres 



tracts, 465 

 blood-vessels of, 460 

 cell-groupings of, 456 

 cells of dorsal horn, 456 

 of Golgi, T^'pe II., 452 



of the intermediate gray mutter, 



456 

 of ventral iiorn, 457 



Spinal cord, cell-groupings of outside 

 cord, with axones to white matter 

 of cord, 440 

 central canal of, 422, 455 



gelatinous substance, 455 

 cervical enlargement of, 448, 461 



segments of, 449 

 Clarke's column of, 456, 461, 469 

 coccygeal segments of, 449 

 collaterals of, 453 



column of Burdach, 455, 465, 467, 

 468. 

 of GoU, 455, 468 

 cells, 449, 450, 457 

 hecateromeric, 451 

 heteromeric, 451 

 tautomeric, 450 

 conduction paths of, 427, 467 

 cornua of, 454 

 descending paths from higher centres, 



470 

 diagram showing tracts of, 466 

 direct ascending paths to higher 

 centres, 469 

 cerebellar tracts, 469 

 pyramidal tract, 470 

 reflex collaterals. 458 

 dorsal gray columns, 454 

 commissure, 455 

 spino-cerebellar tract, 469 

 white columns, 454 

 commissure, 456 

 dura mater of, 428 

 ependyma of, 459 

 fasciculus, medial longitudinal, 473 



of Thomas, 473 

 fibre tracts of, 465 



methods of determining. 465 

 filum terminale of, 44S 

 Flechsig's tract, 469 

 fundamental columns of, 451, 474 

 ganglion cells of, 449 

 gelatinous substance of Rolando, 455 

 general topography of, 454 

 Gowers' tract, 470 

 gray matter of, 426, 455 

 ground bundles of, 451, 474 

 Helweg's tract, 473 

 interchange of fibres, 458 

 intermediate gray matter, 456 

 lateral horn of, 456 

 ligamentum denliculatum, 455 



