A CASE OF CYCLOPIA 



245 



ABBREVIATIONS 



FIGURES 24 TO 47 



Figures 24 to 47 are drawn from a series of transverse sections through the 

 cyclopian brain stem, stained by a modified Weigert method followed by Upson's 

 carmine. The drawings which are here reproduced at a magnification of X 2.5, are 

 all so arranged that the right and left sides of the sections correspond to the right 

 and left sides of the page respectively. In examining this series it is well to bear 

 in mind that in this brain stem two marked flexures persist. Thus for example, 

 in figure 34, the midbrain and medulla appear in almost transverse section while 

 the intervening pons is cut horizontally for the most part. An explanation of 

 the abbreviations used in these figures will be found in the accompanying list. 



Aq.c, aquaeductus cerebri 



B., thalamic fibers that have wandered 

 ventrad into the pia 



Br.c, brachium conjunctivum 



C.C., canalis centralis 



C.hb., commissura habenularum 



C.isl., cell islands in second layer of 

 cortex cerebri 



C.i., colliculus inferior 



C.L., continuation into the medulla of 

 the lateral column of the cord 



Cor.cer., cortex cerebri 



Cor.pin., corpus pineale 



C.p., commissura posterior cerebri 



C.S., colliculus superior 



C.t., corpus trapezoideum 



D.Br.c, decussatio brachii conjunctivi 



Dec.l., decussatio lemniscorum 



D.N. v., decussating tract of N. tri- 

 geminus 



D.t.d.M., decussatio tegmenti dorsalis 

 Meynerti 



F.a.e., fibrae arcuatae externae 



F.a.i., fibrae arcuatae internae 



F.C., funiculus cuneatus 



F.l.m., fasciculus longitudinalis medi- 

 alis 



F.r.M., fasciculus retroflexus Meynerti 



L.I., lemniscus lateralis 



L.m., lemniscus medialis 



L.S., lemniscus superior 



N.C.I., first cervical nerve 



N.III., N. oculomotirii 



N.I v., N. trochlearis 



Nu.a., nucleus arcuatus 

 Nu.a.c, nucleus alae cinerae 

 Nu.amb., nucleus ambiguus 

 Nu.c.a., nucleus of the anterior horn 

 Nu.c.i., nucleus coUiculi inferioris 

 Nu.coch., nucleus N. cochleae ventralis 

 Nu.coch.d., nucleus N. cochleae dorsalis 

 Nu.c.r., nucleus of restiform body 

 Nu.d., nucleus dentatus 

 Nu.emb., nucleus emboliformis 

 Nu.f.c, nucleus funiculi cuneati 

 Nu.f.g., nucleus fijniculi gracilis 

 Nu.f.l.m., nucleus faciculi longitudi- 

 nalis medialis (Darkschewitsch) 

 Nu.g., nucleus globosus 

 Nii.h.b., nucleus habenulae 

 Nu.l.l., nucleus lemnisci lateralis 

 Nu.lat.1,2,3, nuclei distinguished in 

 the lateral portions of the thalamic 

 mass 

 Nu.lat.th., lateral thalamic nucleus 

 Nu.med.th., medial thalamic nucleus 



THE JOURNAL OF COMPARATIVE NEUROLOGY, VOL. 23, NO. 3 



