282 THE NERVOUS SYSTEM 



the roof of the inferior horn of the lateral ventricle. According to Cajal (1911), it contains 

 both commissural and projection fibers, the majority of which take origin from the olfactory 

 cortex of the hippocampal gyms. A smaller number may arise in the amygdaloid nucleus. 

 After following the curved course of the caudate nucleus, it bends ventrad toward the 

 anterior commissure. Some of the fibers cross in the anterior commissure and end in the 

 olfactory cortex of the opposite temporal lobe and in the septum pellucidum. The majority 

 of the fibers, however, enter the mesencephalon and apparently end in the interstitial nucleus. 



The striae longitudinales, fornix longus, and the fiber tracts found in the 

 subcallosal cortex and septum pellucidum have apparently been subject to 

 much misinterpretation; but the subject is too extensive to be considered here. 

 (See Cajal, Histologie du Systeme Nerveux, Vol. II, pp. 783-823.) 



The anterior perforated substance, or at least its more rostral part, which 

 corresponds to the tuberculum olfactorium of macrosmatic mammals, receives 

 besides fibers from the olfactory tract other afferent fibers which, according to 

 Edinger (1911), come from the pons, perhaps from the sensory nucleus of the 

 trigeminal nerve. It is probably "especially concerned with the feeding reflexes 

 of the snout or muzzle, including smell, touch, taste, and muscular sensibility, 

 a physiologic complex which Edinger has called collectively the 'oral sense' " 

 (Herrick, 1918). 



