THE SUBTHALAMIC REGION, ETC. 



107 



attached to the anterior pair. (Compare Lecture II, Figs. 11- 

 17.) From the anterior qnadrigeminal bodies arise a large por- 

 tion of the optic nerve-fibres. They, like the thalamus, receive 

 fibres from the region of the occipital lobe, which run in the 

 optic radiation to the internal capsule, and from there pass up- 

 ward to the thalamus in the brachium of the anterior quadri- 



Corp.y.la 

 Corp. yen med 



Corp. 

 Corp. tjViJ. 



FIG. 61. 



reniovi 

 The re 

 centres is shown in diagram. 



Bintlearm Peduncle. FIWK. Crusta. Bint. Ann, Post, brachium. 



Stabkranz zu den Optic Centr., Coronal fibres to the optic centres. 



V. Arm, Ant. brachium. 



geminal body. In this brachium anterius the fibres pass 

 downward to the optic tract. The brachium anterius, which is, 

 therefore, composed of fibres from the cortex and of fibres to 

 the optic tract, passes, with the fibres from the cortex only, into 

 the corpora quadrigemina. The fibres to the optic nerve spread 



