INDEX 



641 



Nerves, trigeminus, mandibular branch, 500 

 maxillary branch, 500 

 mesencephalic root of, 523 

 opthalmic branch, 500 

 trochlear, IV, 462 



nucleus and roots of, 488 

 vagus, X, 462, 464 

 afferent roots, 499 

 efferent fibers of, 496 



nuclei and roots of, 488, 518 

 ganglia of root, 495 

 ganglion of trunk (nodosum), 495 

 Nerves, spinal, peripheral, dorsal branch of, 487, 



490 



ventral branch, 487, 490 

 Nervous system, the 447 

 anomalies of, 560 

 anterior neuropore, 451 

 brain, 453 

 central distinguished from peripheral, 



449 



cerebrospinal ganglia, 45 1 

 components of , afferent and efferent, 447 

 derivation of, 451 

 epichordal segmental brain and nerves, 



459 



general considerations of, 447, 448 

 human, 489 

 nerve fibers, 451 

 neural crest, 451 



folds, 451 



groove, 451 



plate, 451 



tube, 451 



primitive nervous mechanism, 448 

 root fibers of, 451 

 spinal cord and nerves, 453, 457 

 three-neurone reflex arc, 450 

 two-neurone reflex arc, 448 

 vertebrate, 450 

 central, 449 



supraseg mental structures of, 450, 457 

 human, afferent peripheral and sym- 



pathetic neurones, 489 

 anomalies of, 560 

 cell proliferation of, 479 

 cerebellum, 455, 457, 466, 512, 525 

 corpora quadrigemina, 467, 517, 530 

 development of the lower (interseg- 



mental) intermediate neurones, 502 

 differentiation of peripheral neurones of 



cord and epichordal segmental brain, 



486 



Nervous system, human, early differentiation 



of nerve elements, 483 

 epicordal segmental brain, 512 

 epithelial stage of, 479 

 further differentiation of neural tube, 



506 

 general development of, during first 



month, 472 

 histogenesis of, 478 

 spinal cord, 506 

 peripheral, 447 

 effectors of, 448 

 receptors of, 448 

 sympathetic, 458 



efferent peripheral visceral neurones of, 



45i 



vertebrate, bilateral character of, 450 

 cephalization, 450 

 general features compared with human, 



457 



general plan of, 450 



segmentation of, 450 



typical, 450 

 Net knots, i 

 Neural crest, 75, 451, 490 



relation to cerebrospinal ganglia, 451 



segmentation of, 451 



separation of, 451 

 folds, 69, 451, 472 



fusion of, 451, 472 



groove, 69, 73, 74, 80, 85, 87, 135, 451, 472 

 plate, 77, 451, 472 



differentiation of, 453 

 tube, 70, 80, 451, 472 



alar plate, 477, 512, 515, 519 



basal plate, 477, 512, 514 



blood vessels of, 508 



cells of, 479, 481, 483, 484 



cervical flexure, 478 



defects in the region of, 607 



floor plate of, 453, 473 



further differentiation of, 506 



lateral plates of, 453, 473 



layers of, 479, 485, 514 



limiting membranes of, 479 



neuromeres, 456, 477 



order of development of, 478, 506, 515, 



5i9, 542 



origin of malformations of, 607 



roof plate of, 453, 473, 513 



sulcus limitans, 477, 512 

 Neurenteric canal, 70, 317 

 Neurilemma, 478, 492 



