iio8 



INDEX 



Pyramidal decussation in gibbon, 418-423 

 in gorilla, 654-658 

 in human, 795, 800, 801, 804 

 in lemur, 35, 38, 41, 42, 44, 76, 80 

 as mammalian contribution, 423 

 in marmoset. 162, 164, 165, 166, 184, 185, 188 

 in mycetcs, bearing of, on voluntary' control, 208, 



209, 211, 212, 235 

 in orang, 498, 502, 509, 536 



indicates increase in volunt^iry control, 503-506, 

 507 

 in Pithecus rhesus, 359-367, 391-396 

 in primates, distinct nature of, 423 



dynamic significance of, 423 

 relation of, to cortical control of behaxinr, 423 



to ncopallial development, 423 

 in tarsius, 100, 103-105, 136, 149 



Pal-W'eigert preparations of, 103 

 Pyramidal fasciculi in lenuir, 41, 42, 56, 59, 79 



in mycetcs, 238 

 Pyramidal system in chimpanzee, 603, 605 

 in dog-headed baboon, 304, 305, 320, 325, 326 

 in gorilla, 658, 662, 672, 674, 679 



function of, 682 



massive character of, 658 

 in higher anthropoids, 699-703 



coellicients of, 701 



comparison of, with int^Tiiiediatc mid lower 

 primates, 702, "05 

 index of volitional control, 212, 2 [6, 22-, 305, 310, 



422, 457, 699, 701 

 in intermediate primates, 457 



coefhcients of, 457, 458 

 in lemur, 34, 35, 38, 41, 42, 46, 56, 58, 50, 64, 68, 



71. 79 

 mammalian acquisition, 421, 699 

 in man, cxtensiveness of, 801, 806 



path of, loio, loi I 



relation of, to motor area, 101 1 



significance of, 806 

 in marmoset, insignificance ol, 162, 16-, 172 

 in mycetes, 223-227 

 in orang, 529 

 in Pithecus rhesus, 365, 368, 3-^1, 377, 383, 399, 



702 

 relation of, to cerebral cortex, 422 



to cerebral peduncle, 682 



to decussation, 421 

 in tarsius, 1 27 



emphasizes low organization of pons Varolii, 

 124 



Pages I 474 are in Volume I, 



Pyramidal tract in chimpanzee, 591, 592, 614, 617 

 comparison of, in lemur, marmoset, mycetcs and 



tarsius, 243-246 

 in gibbon, 448, 450, 451 

 in gorilla, 659, 692, 693 

 in man, axons in, loii 



condensation of, 101 1, 1014 



relation of, to cerebral peduncle, -92, 849, 850, 

 loio, lOI I 

 in orang, 529, 536 

 in Pithecus rhesus, 399 

 relation of, to behavior, 244 



to skilled acts, 244, 245 



to voluntary control, 243, 244 

 in tarsius, 102, 105 

 Pyramids in chimpanzee, 572, 578, 580, 583, 586, 



591, 613, 617 

 in baboon, 299, 300, 306-321, 324-328, 342 

 in gibbon, 417-435, 455 

 in gorilla, 654, 655, 662-674 



indications of, as to voluntary control, 655, 656 



prominence of, 655 

 large, in man, 795, 796, 797, 805, 806, 808 

 in lemur, 45, 48, 49, 50, 52, 53, 55, 57, 60, 61 

 in marmoset, 162, 165 -175 

 in mycetcs, 208-217, 218-226 

 in orang, 498, 517, 539, 540 

 in Pithecus rhesus, 359-398 

 relation ot, to volitional control over somatic 



musculature, 656, 663 

 in tarsius, small size of, 99, 100, 104, 106, 108, 

 III 1 13, 1 1-, 1 18-125 



relation ol, to voluntary movement, 117 



QIIADRIGF.MINAL plate of midbrain, in chim- 

 [jaiizee, 5-5, 599, 601 

 in dog-headed baboon, 303, 325 

 in gibbon, 439 

 in gorilla, 657 

 in lemur, 40, 63 

 in macacus, 363 

 in man, 799 

 in orang, 500, 501, 525 

 Quadrilobular arrangement, 945, 964, 965 

 Quadrumanal characters augmented by psychic 

 influences, 15 

 developed from arboreal transit, 14, 15 

 established in Cebidae, 16, 230 

 in lower primates, 257 



as retarding specialization in upper extremi- 

 ties, 717 

 pages 475 11 20 in Volume II. 



