470 THE NERVOUS SYSTEM. 
warrantable violence to terms in general use, and such a 
change of nomenclature is quite inconsistent with the homo- 
logy of the parts from a developmental point of view. The 
optic peduncle exhibits three very distinct bundles of fibres, 
which I shall term (1) the commissural fibres (m, fp); (2) the 
thalamic fibres (v), which include the oculo-olfactory bundle ; 
and (3) the mesocephalic fibres (m), which form the greater 
part of the optic peduncle. 
2. The Inner Medulla may be described as consisting of an 
anterior medullary mass (ac), which I shall term the corpus 
ovale, partially embraced behind by a concavo-convex lentiscus 
Fic, 61.—A lateral section of one of the Optic Ganglia: ac, anterior capsule ; 
¢, middle capsule ; //, the tenia endiag in Cuccati’s bundle and the posterior 
commissure ; ¢', annular region of the cortex ; £°, the corona ; *, posterior, and 
g, anterior, cell groups; m, fibres of the peduncle entering the mesocerebron ; 
mc, middle commissure of optic ganglia traversing the floor of the cavity of the 
cerebron ; oc, external medulla ; on, chiasma of optic nerve; /, posterior fibres 
of the peduncle ; fc, posterior capsule ; 72, retina ; 24, thalamic lobe ; v, thala- 
mic fibres of the optic peduncle entering the thalamic lobe. 
(pc) ; this is the posterior capsule of Viallanes. Between the 
corpus ovale and the posterior capsule there is an intermediate 
layer, which differs entirely from the posterior capsule and 
corpus ovale. This I term the middle capsule (c). Many of 
the fibres of the middle capsule enter the thalamic bundle of 
the optic peduncle, and others are lost in the corpus ovale (ac) 
and the lentiscus (pc). They diverge radially at their outer 
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a SS — 
