THE THIRD VENTRICLE AND INTER-BRAIN. 



The following are the boundaries of the third ventricle: 



Roof- 

 Posterior commissure and commissura habenularum, 

 Roof epithelium and pineal body, 

 Chorioid tela and plexuses, 

 Fornix and commissura hippocampi. 



Fig. 38. Transverse section of left cerebral hemisphere cutting the splenium and 

 showing the posterior horn and the floor of the inferior horn of the lateral 

 ventricle. (Original.) 



a. Crus fornicis. b. Fis. hippocampi, c. Hippocampus, d. Fascia dentata. e. Eminentia 

 collateralis. f. Fis. collateralis. h. Calcar avis. i. Bulb caused by forceps major, j. Tape- 

 turn, k. Radiatio occipito-thalamica. 1. Fasciculus longitudinalis inferior. 



Anterior wall 



Epithelium, covering 



Columnae of fornix, anterior commissure, and 

 Lamina terminalis. 

 Floor- 

 Optic commissure, 

 Tuber cinereum and infundibulum, 

 Corpora mammillaria, 



