. On the anatomy of vertebrates [electronic resource] . ic lobes or nates,fig. 68, a, proportionally larger than they are in a Carnivorousquadruped with a similar-sized brain. In both the 6 testes, ib. b,are broader, but in Felis they also rise higher; whilst in Un-gulates, and especially Ruminants, the e nates show the greatervertical In all Carnivores the (testes have a minor anteroposteriorextent than the 6 white bands ortracts (c brachia in an-thropotomy), extendingalong the outer sidesof the bigeminal bodiesto the thalami and com-mencement of the optictracts, fig.
. On the anatomy of vertebrates [electronic resource] . ic lobes or nates,fig. 68, a, proportionally larger than they are in a Carnivorousquadruped with a similar-sized brain. In both the 6 testes, ib. b,are broader, but in Felis they also rise higher; whilst in Un-gulates, and especially Ruminants, the e nates show the greatervertical In all Carnivores the (testes have a minor anteroposteriorextent than the 6 white bands ortracts (c brachia in an-thropotomy), extendingalong the outer sidesof the bigeminal bodiesto the thalami and com-mencement of the optictracts, fig. 68, d, areprominent in the higherQuadrumana and inMan. In most Gyren-cepliala the white fibrescontinued from the optic lobes develope an oblong nodule, ib. e,also containing grey matter ( corpus geniculatum of anthro-potomy), which in the human brain is divided into an externaland internal portion. The ( crura cerebri formed by the pre- and post-pyramidal 1 This difference I exemplified in the preparations, nos. 1326 a and 1326 b, iii. p. Mesencephalon, upper view, Horse. PROSENCEPHALON OF MAMMALS. 99 and (teretial tracts, expand in passing beneath the bigeminalbodies, and receive accessions from grey matter continuous withthat of the macromyelon, but so dark as to have received thename locus niger when exposed in section. They are dividedby the third ventricle, and swell out respectively at their upperpart, through the superaddition of formative neurine, into thebodies called e thalami optici, fig. 68, c, figs. 71 and 75, t. Thefree surface is white, but the grey matter constitutes their chiefbulk, and is partially divided by the longitudinal fibres into anouter and an inner portion: from the latter the soft commissureis continued. The optic tracts, fig. 68, d, commencing at the opticlobes and geniculate bodies, bend round the outer and back partof the i thalami, from which they derive accessory filaments to formthe optic nerve. In connection with the mesencephal
Size: 1777px × 1407px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, booksubject, booksubjectbirds, booksubjectfishes
