208 



THE ESSENTIALS OF HISTOLOGY 



FIG. 244. SECTION ACROSS THE OPTIC THALAMUS AND CORPUS STRIATCM 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. middle commissure ; r. 3. third ventricle ; a small part is also seen below 

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

 cle and thalamus by the velum iuterpositum. 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. 1. ; t.s. teeuia semicircularis ; cr, forward prolongation 

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

 tion of the tegmentum, .-onsisting of (1) the dorsal layer, (2) the zona incerta, and (3) the 

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

 turn ; n.l. nucleus lenticularis ; e. c. external capsule; cl. claustrum ; /, island of Eeilj 

 h, hippocampus ; d, fascia dentata. 



FIG. 245. HORIZONTAL 

 SECTION THROUGH THE 

 MIDDLE OF THE RIGHT 

 CEREBRAL HEMISPHERE. 

 (Natural size.) 



v.l. lateral ventricle, anterior 

 coruu ; c. c. corpus callo- 

 sum ; s. I. septum lucidum ; 

 a./, anterior pillars of the 

 fornix ; v. 3, third ven- 

 tricle; th, thalamus opti- 

 cus ; s.t. stria terminalis; 

 n. c, nucleus caudatus, and 

 n. 1. nucleus lenticularis of 

 the corpus striatum ; i. c. 

 internal capsule ; g, its 

 angle or genu ; n. c. tail of 

 the nucleus caudatus ap- 

 pearing in the descending 

 cornu of the lateral ven- 

 tricle ; cl, claustrum ; 7, 

 island of Reil. 



