AUTHOR'S ABSTRACT OF THIS PAPER ISSUED 
BY THE BIBLIOGRAPHIC SERVICE, MARCH 20 
THE MOTOR NUCLEI OF THE CEREBRAL NERVES IN 
PHYLOGENY. A STUDY OF THE PHENOMENA 
OF NEUROBIOTAXIS 
IV. AVES 
DAVIDSON BLACK 
Central Institute for Brain Research, Amsterdam, Holland, and the Anatomical 
Department, Peking Union Medical College, Peking, China 
SIXTEEN FIGURES 
CONTENTS 
HintRO CUE OIA creer eae ae eee ee eos A EE Peds baehedt ba aed 233 
Motor roots and nuclei in Cacatua and Ciconia..............-.e.-.-eeece: 234 
ING EO ORI UIE. Paine Re eS Oe a gee Te aie ow ae 5”) es 234 
ERAS LEAs DOM HN TIGG UO EP ae UP ae aE A 7 i 238 
INTHE WD eo aon 6 Sea hte ol Sachi eRe atc me A a ee TO 242 
WIG @ WA oS ee Boel 6 Ae be Oe hee ie ce eee ne ne ee Pa 244 
INGE Weg Sc ac he BS Sle etek eee ie tie Ain AOE A Sra oo De ae oN a 246 
Iiermyag JUL in| UNS 5 eis Sie A, Sea ee ee ais cies ee epee wR 249 
DISCUSSION OT Neate cee Se eee scar, Say tea, Mee ha 2 261 
Ie eRnEM ING, CONMPLOK eet AAR hs. Sos ace a ee dacahioadrs ask caeres woo at 261 
2 eeNSCECLA EM OGOLLTUG Le epee emer et aan 6 cn tn cece See slo boas 264 
INGE UStACCESSOLIUSS Mee ee ey seek HRA ee Boodle soem 264 
Nerves! ireeande Xx. Me ume eee is le occ da ene Ries echo ene 9265 
MGtOr Vee Complexe meme Mime kes | Aue ipl we 8) ko ames 267 
SE eITUSE LCR TCRROR MS pie fy he Ree oo aral Riy Tren Mg a ey ot og Saran 269 
INET Vee VD SRL teens Ml Blt S SPEER TL SEAS LA eg RE ea TA 269 
Nemes Jeane Passes my ee rhc ot, ene Se rere tS 269 
‘CTCLURI OT OD SAtoe re. See iat: MRR any ke a oe eS. i eee 5 ane 270 
eT GUe™ CGEM Grae x eectane Wneeet oe ecy Pays ROE ee eee vehiaes oan cot 4 Eee 6. ER ERE SNS 273 
INTRODUCTORY 
The following paper on the avian cerebral motor nuclei con- 
stitutes part 4 of a study on the phylogeny of these nuclei in 
vertebrates. Reference to my earlier communications on this 
subject renders unnecessary a further explanatory statement 
(8, 9, 10). 
233 
THE JOURNAL OF COMPARATIVE NEUROLOGY, VOL. 34, NO. 2 
