THE NERVOUS SYSTEM. 



297 



anterior cornu of the ventricle, its narrow end directed outward 

 and backward, and separated from its fellow by the thalami 

 optici. 



The intraventricular portion is called the caudate nucleus, 

 the extraventricular the lenticular nucleus, the two separated 

 by the internal capsule. 



caud 



PIG. 136. 



The lateral ventricles and choroid plexus. St. term., stria terrain- 

 alls; Thai., thalamus; Hipp., hippo-campus; Fimb., flmbria; Ant. cor., 

 anterior cornu of lateral ventricle; Nucl. caud., nucleus caudatus; Col. 

 for., columns of the fornix; Vel. int., Velum interpositum; Ch. pi., 

 choroid plexus; Cal. av., calcar avis; Post, cor., posterior cornu of 

 lateral ventricle. (After Gray.) (Whitehead.) 



The internal capsule is a large layer of white fibre?, derived 

 from the medulla and crura cerebri, separating the lenticular 

 nucleus from the caudate nucleus anteriorly, and the lenticular 

 nucleus from the optic thalamus posteriorly. 



