THE INTERNAL CONFIGURATION OF THE CEREBRAL HEMISPHERES 



257 



Smith (1919), the claustrum, putamen, amygdaloid nucleus, and the greater 

 part of the caudate nucleus are pallial derivatives and are closely related mor- 

 phologically to the neopallium; while the globus pallidus is the representative 

 in the mammalian brain of the corpus striatum of lower forms, as seen in the 

 shark (Fig. 9). 



The Amygdaloid Nucleus. In the roof of the terminal part of the inferior 

 ventricular horn, at the point where the tail of the caudate nucleus ends, there 

 is located a small mass of gray matter, known as the amygdaloid nucleus (Fig. 



Radiatio corporis N 



callosi 



Bui bus cornu-. 

 posterioris 



Calcar 



Hippocampus -^ '' , 

 * - - /,' s 



Corpora 



tjuadrigemina -- . 

 Nucleus 

 .colliculi 

 inferioris 



Aquaeductus /_/. 

 cerebri 



?.*, 



Nucleus n 

 trochlearis ... .... x 



T^ I ''/' : 'j '' 



Fasciculus _. 



longitudinalis 

 medial is 



Cerebellum--' 

 Brachium pontis --' 



Flocculus 



Pyramis medullae oblongatae.-'" 



, Splenium cor- 

 poris callosi 



Tela chorio- 



idea ven- 

 triculi tertii 

 T Corpus 

 >'' pineale 



Cornu posle- 

 ,'' rius-ventri- 

 culi lateralis 

 ^, Glomus 



chorioideum 

 yA-r- J ':'" ^--^--- Tapetum 



_ ...v.t Radiatio occi- 



i \\ \\' pitothalamica 

 Eminentia 

 collateralis 



Fissura 

 *. \;> collateralis 



Lemniscus 

 ' J ^ lateralis 

 ""J Brachium con- 

 junct! vum 

 -- Stratum griseum 



centrale 

 ~~- Lemniscus medialis 



N. vagus 



Fig. 190. Frontal section of the human brain through the splenium of the corpus callosum. View 

 into the posterior horn of the lateral ventricle. (Toldt.) 



185). It is continuous with the cerebral cortex of the temporal lobe lateral to 

 the anterior perforated substance (Fig. 198; Landau, 1919). 



The external capsule is a thin lamina of white matter separating the claus- 

 trum from the putamen. Along with the internal capsule it encloses the lenti- 

 form nucleus with a coating of white substance. 



THE INTERNAL CAPSULE 



The internal capsule is a broad band of white substance separating the 

 lentiform nucleus on the lateral side from the caudate nucleus and thalamus on 

 the medial side (Figs. 191, 192). In a horizontal section through the middle 



17 



