208 



THE ESSENTIALS OF HISTOLOGY 



FIG. 244. SECTION ACROSS THE OPTIC THALAMUS AND CORPUS STRIATUM IN THE 



REGION OF THE MIDDLE COMMISSURE. (Natural Size.) 



th, thalamus ; a, e, i, its anterior, external, and internal nuclei respectively ; w, its external 

 white layer ; m. c. midd.e commissure ; v. 3. third ventricle ; a small part is also seen below 

 the middle commissure ; c. c. corpus callosum ; /', fornix, separated from the third ventri- 

 cle and thalamus by the velum interpositum. In the middle of this are seen the two veins 

 of Galen and the choroid plexuses of the third ventricle; and at its edges the choroid 

 plexuses of the lateral ventricles, v. I. ; t.s. tasnia semicircularis ; c>\ forward prolongation 

 of the crusta passing laterally into the internal capsule, i. c. ; s. t. r. subthalamic prolonga- 

 tion of the tegmentum, consisting of (1 ) the dorsal layer, (2) the zona incerta, and (3) the 

 corpus subthalamicum ; s. n. substantia nigra ; n. c. nucleus caudatus of the corpus stria- 

 turn ; n. 1. nucleus lenticularis ; e. c. external capsule ; cl. claustrurn ; /, island of Eeil ;. 

 A, hippocampus ; d, fascia dentata. 



FIG. 245. HORIZONTAL 

 SECTION THROUGH THE 

 MIDDLE OF THE RIGHT 

 CEREBRAL HEMISPHERE. 



(Natural size.) 



v.l. lateral ventricle, anterior 

 cornu ; c. c. corpus callo- 

 sum ; s. I. septum lucidum ; 

 ./. anterior pillars of the 

 foruix ; v. 3, third ven- 

 tricle; th, thalamus opti- 

 ons; s.t. stria terminalis; 

 n. c. nucleus caudatus, and 

 n. I. nucleus lenticu'aris of 

 the corpus striatum ; i. c. 

 internal capsule ; g, its 

 angle or genu; n. c. tail of 

 the nuc'eus caudatus ap- 

 pearing in the descending 

 cornu of the lateral ven- 

 tricle ; cl. ciaustrum : I r 

 island of Reil. 



