THE INTERNAL CONFIGURATION OF THE CEREBRAL HEMISPHERES 



259 



laterally and toward the occiput between the lentiform nucleus and the thala- 

 mus. 



The anterior limb of the internal capsule, intervening between the caudate 

 and lentiform nuclei, is broken up by bands of gray matter connecting these 

 two nuclei. It consists of corticipetal and corticifugal fibers. The former 

 belong to the frontal stalk of the thalamus or anterior thalamic radiation from the 

 lateral nucleus of the thalamus to the cortex of the frontal lobe. The cortici- 



Septum pellucidum ,^ 

 Fornix^ 



Chorioid fissure 

 Third ventricle ^ 



Thalamus^ s^ 



/ ~"> 



Habenular trigone -^K 



Habenular commis- ^U 

 sure I 



Transverse fissure ^| 



Pineal body 



Inferior horn of _ 

 lateral ventricle 



Superior colliculus 



':: 



-' Genu of corpus callosum 

 .^Anterior horn of lateral ventricle 



, Anterior limb of internal cap- 

 sule 



fe.- Head of caudate nucleus 

 ~~Insnla 



r- External capsule 



-^ Lentiform nucleus 



'Claitstrum 



\ N " % *. Genu of internal 



capsule 



\ 



\"y ^Posterior limb of 

 internal capsule 



v/ Chorioid fissure 

 \j& ; * ^Fimbria of hippocampus 

 \) "Hippocampus 

 ^-^Cerebellum 



Medulla oblongata 



Fig. 192. Horizontal section through the sheep's brain, passing through the internal capsule and 



corpus striatum. 



fugal fibers form the frontopontine tract from the cortex of the frontal lobe to 

 the nuclei pontis (Fig. 193). 



The posterior limb of the internal capsule intervenes between the thalamus 

 and the lentiform nucleus, and bends around the posterior end of the latter 

 on to its ventral surface (Fig. 194). It accordingly consists of three parts, 

 designated as lenticulothalamic, retrolenticular, and sublenticular. The lentic- 

 ulothalamic part consists of fibers belonging to the thalamic radiation intermingled 

 with others representing the great efferent tracts which descend from the cere- 



