ON THE DEVELOPMENT OF THE BRANCHES 
ponlgnya 
1b 
OF THE FIFTH CRANIAL 
NERVE IN MAN. By A. FRANCIS DIXON, B.A., M.B., Chief Demonstrator of 
(Plates I. and IT.) 
Anatomy, Trinity College, Dublin. 
[ coMMUNICATED BY PROFESSOR D. J. CUNNINGHAM, M.D., F.R.S., HON. SEC., R.D.S. | 
[Read Drcemprr 18, 1895. ] 
TABLE OF CONTENTS. 
PAGE PAGR 
GENERAL STATEMENT, 19 | Crrrary GaneLion—continued. 
= y oT 
Mernop or Investrcation EMPLOYED, v ae 929 PosstsLE ExPLANATION oF Srpewick’s Opsrr- 
VATION OF THE ORIGIN OF THE TurrRD Nerve 
OpuTHALMic Dryision or THE Firrn Nerve, From THE NasAt GANGLION, 48 
Nop Ornate Prostar mvs a nate Structure or Crnmary GANGLION IN THE y Aston 48 
° —Frontat NrervE A LATER 
lee aa 30 Superior Maxitrary Division or tur Firta Nerve, 
b) 9 O S , Me 5 
uPERIOR Maxintary Nerve an INDEPENDENT 
VES IN DIFFERENT PARTS OF THEIR 
aon o Nzr 39 BrancH or THE GASSERIAN GANGLION IN 
’ : Empryo or Four Werks, 55 
CoMPLICATIONS IN COURSE OF Nese AND OTHER M SG 
Nerves Expnarnep py a Stupy or NERVES IN ECKEL'S \xANGUION, 
THE Empryo: NERVE-BRANCHING, &C., 33 Source or Cetis or Mrcxer’s GANGLION, 55 
Bearp’s MesocEPHALIC GANGLION AND THE Distinct CELLULAR CONNECTION BETWEEN Oric 
CintAry GANGLION oF Prorrssor His, 36 AnD MeEcKet’s GANGLION IN EmBryo, 56 
Ortern or Nasat Nerves 1n Mammats Anp Vivran Nerve A BRANCH OF THE FACIAL, AND ONLY 
Lower ANIMALS, 38 LATER CONNECTED WITH THE FirtH Nerve, 56 
Fate oF THE CELLULAR PROLONGATION Or THE Inrertor Maxinvary Drviston or THe Firrn Nerve, 
P pee tN MAN AnD IN — Rat, 40 Inrerion Denran rue First Representative 
ROBABLE HOMOLOGY BETWEEN THE FRONTAL or Inrerron Maxrpnary; Linauat Nerve a 
NERVE AND THE OPHTHALMIC DryISION OF THE LATER FORMATION, 64 
Firra in ELaAsMoBRANCHS, 42 Connection or Motor Roor OF p Frere Nerve 
with Inrertor Maxiiary Drvision, 64 
Cru1ary GANGLION :— i 5 
First pistincr Iv Embryo AT BEGINNING OF HHSC! CSD) EABHEL ESO ELMER S CENCE YN) . . 65 
Srxtu WEEK, .. 49 | Connections or THE Firth Nerve witTH OTHER 
eae sees 3 = = 
wean GF Gis ax Cee Ne icnsde a CrantaL Nerves iv Empryo or Srven WEEKs, 65 
Lower ANmALS AND In Many, 44 | Cuorpa TyMPANI NERVE, A TRUE BRANCH OF Facrat, 65 
Prorressor His DERIVES THE Gans FROM THE NERVE OF JACOBSON, A TRUE BRANCH OF GuLOsso- 
ANTERIOR END OF THE ‘‘ Pe EE 44 PHARYNGAL NERvE, 65 
Fare or THE ‘‘ GANGLIENLEISTE’’ ACCORDING TO GENERAL APPEARANCE OF THE (Gacawackn Gaxenion 
GoroNoWITSCH AND SEDGWICK, 45 AND Curer Brancnes or Firru Nerve in THE 
OnIGIN oF THE GANGLION OF THE TRIGEMINAL, Empryo, or a 67 
AnD or NERVES, ACCORDING TO THESE AUTHORS, 45 | Summary, 68 
General Statement. 
Tue following observations on the development of the branches of the fifth 
cranial nerve in man were undertaken at the suggestion of Professor His, who 
was not only kind enough to give me a place in his laboratory, and permission to 
make models of the cranial nerves in his beautiful series of human embryos, 
but has also given me much valuable assistance in carrying out the work itself. 
Up to the present, if we omit the short description given by Professor His,* 
* « Geschichte des Gehirns sowie der centralen und peripherischen Nervenbahnen beim menschlichen 
Embryo.” Abhandlungen der Kénigl. Sachs. Ges. d. Wissenschaften, 1888. Bd. xiv. p. 341. 
TRANS. ROY. DUB. SOC., N.S. VOL. VI., PART II. 
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