PLATE I.* 

 Fig. 1. 

 This is a photograph from a dissection made to show the general course of 

 fasciculus occipito-frontalis inferior from the lateral aspect of the brain. F. o. 

 f. i.\ F. o. f. i.^ F. o. f. i.^, F. o. f. i.^ fasciculus occipito-frontalis inferior ; 

 F, unc, fasciculus uncinatus ; F. Rol., fissure of Rolando ; Ext. c., external 

 capsule, with window cut in it to show Nuc. lent., nucleus lentiformis, and 

 arteries to same; F. arc.^ fasciculus arciiatus (horizontal part); F. arc.^ 

 ant. br., anterior bundles from descending branch of fasc. are. ; F. arc* post. br. 

 and F. arc* post, br., posterior descending branch of fasc arc Fibers from 

 c. c, fibers from corpus callosum chiefiy, but some arcuate fibers with them. 

 The white substance of superior temporal lobe in the upper portion consists of 

 fibers from the fasciculus arcuatus. internal capsule, external capsule, and 

 corpus callosum. Fibers from tap., fibers from the tapetum perforating the 

 corona rad. and the Fasc. o. f. inf. to proceed to the end of the temp. lobe. 

 F. trans, o., a posterior part of the fasc. transversus occipitalis. In this dis- 

 section most of this bundle is removed showing a large window through which 

 the fasc. o. f. inf. can be seen. At the anterior of this window a small part of 

 the fasc. trans, occ still remains. 



Fig. 2. 

 This is a photograph of a dissection from the lateral aspect, made to show 

 the anatomical relationship of the fasciculus occipito-frontalis inferior to 

 adjacent anatomical structures. Occ. lobe, occipital lobe ; F. o. f . i.S F. o. f. i.-, 

 F. 0. f. i.^ F. o. f. i.^ fasciculus occipito-frontalis inferior ; F. trans, o., a 

 large bundle of fibers, the posterior part of which belongs to the vertical 

 transverse occipital fasciculus and the anterior part belongs to the fasc. 

 arcuatus plus a considerable quanity from the corpus callosum ; F. o. t., 

 fasciculus occ.-temporalis sweeping baclv from the white substance of the sup. 

 temp, convolution ; Ext. c, external capsule ; Nuc. lent., nucleus lentiformis 

 showing through a window in external capsule; P. of opt. thai., pulvinar 

 of opt. thalamus, also showing under and in front of it are the geniculate 

 bodies and the crus ; Cna. (t. pt.), the broken edge of the temporal part of the 

 corona radiata lying on the descending fibers of the tapetum, stria semi- 

 circularis and the tail of the caudate nucleus which latter does not show well 

 in this picture; F. a. t., fasc. amygdalo-temporalis ; F. u., fasc. uncinatus. 



*The dissections from which the photographs (Figs. 1, 2, 3 and 4) were 

 made are now to be seen in the Warren Museum, Harvard Medical School. 



