660 



INDEX. 



Nervous system, neural tube, 458 



practical suggestions for study of, 



568 



primitive nervous mechanism, 455 

 root fibers of, 458 

 spinal cord and nerves, 460, 464 

 two-neurone reflex arc, 455 

 three-neurone reflex arc, 457 

 vertebrate, 457 

 central, 456 



suprasegmental structures of, 457, 



464 



human, afferent peripheral and sym- 

 pathetic neurones, 496 

 anomalies of, 567 

 cell proliferation of, 486 

 cerebellum, 462, 464, 473, 519, 532 

 corpora quadrigemina, 474, 524, 537 

 development of the lower (interseg- 

 mental) intermediate neurones, 



59 



differentiation of peripheral neu- 

 rones of cord and epichordal seg- 

 mental brain, 493 



early differentiation of nerve ele- 

 ments, 490 



epicordal segmental brain, 519 



epithelial stage of, 486 



further differentiation of neural 

 tube, 513 



general development of, during first 

 month, 479 



histogenesis of, 485 



spinal cord, 513 

 peripheral, 454 



effectors of, 455 



receptors of, 455 

 sympathetic, 465 



efferent peripheral visceral neurones 



of, 458 



vertebrate, bilateral character of, 457 

 cephalization, 457 

 general features compared with hu- 

 man, 464 



general plan of, 457 

 segmentation of, 457 

 typical, 457 

 Net knots, i 

 Neural crest, 79, 458, 497 



relation to cerebrospinal ganglia, 



458 



segmentation of, 458 



separation of, 458 

 folds, 73, 458, 479 



fusion of, 458, 479 

 groove, 73, 77, 78, 84, 89, 91, 139, 



45 8 . 479 



plate, 81, 458, 479 



differentiation of, 460 



tube, 74, 84, 458, 479 



alar plate, 484, 519, 522, 526 

 basal plate, 484, 519, 521 

 blood vessels of, 515 

 cells of, 486, 488, 490, 491 

 cervical flexure, 485 

 defects in the region of, 619 

 floor plate of, 460, 480 



Neural crest, further differentiation of, 513 

 lateral plates of, 460, 480 

 layers of, 486, 492, 521 

 methods of study of, 568 

 limiting membranes of, 486 

 neuromeres, 463, 484 

 order of development of, 485, 513, 



^522, 526, 549 



origin of malformations of, 619 

 roof plate of, 460, 480, 520 

 sulcus limitans, 484, 519 

 Neurenteric canal, 74, 318 

 Neurilemma, 485, 499 



cells of, 499 



Neuroblasts of His, 492 

 Neuro-epithelium, 591, 596 

 Neurofibrils, 485, 491, 496 

 Neuroglia cells, 488, 492 



fibers, 490 



Neuromeres, 463, 484 

 Neurone layer, see Mantle layer 

 Neurones, afferent peripheral, 454, 464, 



496 to 509 



afferent versus efferent, 464 

 association, 464, 475, 535, 537, 565 

 central, 456 

 differentiation of, 485 

 distal (first) optic, 583 

 efferent peripheral, 454, 464, 493 to 



496 

 intermediate, 456, 466, 509 



intersegmental (see also Ground 

 bundles and Formatio reticularis) , 

 466, 472, 485, 509 to 513, 522 

 of epichordal segmental brain, 472 

 to suprasegmental structures, 466 

 intersegmental, of epichordal brain, 



522 to 525 



middle (second) optic, 583 

 somatic efferent, 466 

 splanchnic efferent, 466 

 suprasegmental, 485 

 Neuropore, 74 



anterior, 458, 480 

 Nipple, the, 450 

 Nodule of cerebellum, 533 

 Normal embryos, 158 

 Normoblasts, 272, 273, 274 

 Nose, 457, 464, 512, 589 

 anomalies of, 216, 620 

 bucco-nasal membrane, 590 

 Jacobson's organ, 591 

 nasal conchas, 590 

 origin of, 148, 589 



practical suggestions for study of, 603 

 primitive choanen, 590 



palate, 590 

 sinuses of, 590 

 Notochord, 72, 182 

 Nuck, diverticulum of, 426 

 Nuclear groups, 127 



layer of neural tube, 486 

 membrane of typical cell, i 

 reticulum of typical cell, i 

 Nuclei, lateral, 473 



of columns of Burdach, 466, 473, 478, 



5 2 7 



of columns of Goll, 466, 473, 478, 527 

 of thalamus, 544 



