ABBREVIATIONS 



ca, carotid artery 



cil g, ciliary ganglion 



ertn, epithelium of roof of oral cavity 



fb, fore-brain 



fm, floor of oral cavity 



gX, ganglionic complex of X cranial 

 nerve 



glX, ganglion of IX cranial nerve 



gVII, ganglonic complex'of VII cra- 

 nial nerve 



gV, Gasserian ganglion 



Gasg, Gasserian ganglion 



gsp, great superficial petrosal nerve 



hb, hind-brain 



jugg, jugular ganglion 



7nan, mandibular nerve 



manb, branch of mandibular nerve 



mb, mid-brain 



max, maxillary nerve 



tnaxb, branch of maxillary nerve 



7iX, nIX, nVII, nV, nlll, X, IX, VII, 



V, III cranial nerves 

 nt, neural tube 

 oc, oculomotor nerve 

 ole, olfactory epithelium 

 oph, ophthalmic nerve 

 or, orbit 



otg, otic ganglion 

 pc, sympathetic plexus surrounding 



carotid artery 

 rl, radix ciliaris longa 

 rlX, ramus lateralis vagi 

 rrn, roof of oral cavity 

 scg, superior cervical ganglion 

 spgl, first spinal ganglion 

 sphg, sphenopalatine ganglion 

 submg, submaxilliary ganglion 

 syl, sij2, syS, sy4, sy5, sy6, sy7, 1, 2, 3, 



4, 5, 6 sympathetic ganglia 

 vr, spl, ventral root of first spinal nerve 



PLATE 1 



EXPLANATION OF FIGURES 



1 Diagram illustrating the topographical relationships of the cranial sympa- 

 thetic ganglia to the first spinal and the X, IX, VII, V, and III cranial nerves in 

 an advanced embryo of the toad fish. 



2 Transverse section at level of first spinal nerve and sixth sympathetic 

 ganglion, embryo of toad fish 6 mm. in length. X 300. 



3 Transverse section at level of jugular ganglion and anterior portion of sixth 

 sympathetic ganglion, embryo of toad fish 6 mm. in length. X 300. 



4 Transverse section at level of third sympathetic ganglion, newly hatched 

 embryo of toad fish. X 300. 



5 Transverse section at level of third sympathetic ganglion, embryo of toad 

 fish 6 mm. in length. X 300. 



6 Transverse section at level of second sympathetic ganglion, embryo of toad 

 fish 6 mm. in length. X 300. 



7 Transverse section at level of second sympathetic ganglion, embryo of toad 

 fish 10 mm. im length. X 300. 



260 



