240 THE CEREBRUM. 



indicated, it terminates in the medial nucleus of the corpus mam- 

 millare, partly on the opposite side. Its termination is associated 

 first, with the anterior nucleus of the thalamus by the thalamo- 

 mamrnillary bundle (of Vicq d'Azyr) and, second, with the mid- 

 brain and pons by the pedunculo-mammillary bundles. 



(3) The uncinate fasciculus (fasciculus uncinatus, Fig. 74) is 

 a bundle, with some sharply curved fibers, which arches over 

 the main stem of the fissura cerebri lateralis, and connects the 

 uncus and the anterior temporal region with the orbital gyri and 

 the pole of the frontal lobe. It is situated near the basal surface. 

 Its fibers spread out at both ends in the cortex, and they especi- 

 ally join the medial and posterior orbital and the inferior frontal 

 gyri with the limbic lobe (Barker). Like the cingulum and for- 

 nix, it is connected with the rhinencephalon. Lesion in any one 

 of these three bundles causes disturbance of smell. 



(4) The superior longitudinal fasciculus (fasciculus longit- 

 udinalis superior, Fig. 74) is a sagittal bundle located beneath 

 the convex surface of the hemisphere, just above the posterior 

 ramus of the lateral fissure of the cerebrum. According to Cun- 

 ningham, it runs just above and behind the putamen of the lenti- 

 form nucleus, external to the base of the corona radiata. Its 

 fibers diverge at the posterior end of the lateral fissure and radiate 

 into the parietal, occipital and temporal cortex: some of them, 

 arching around that fissure, run as far forward as the temporal 

 pole. The superior longitudinal bundle joins the frontal cortex 

 with the parietal, occipital and the external temporal. It thus 

 associates the psychic auditory and visual centers with the motor 

 speech center; hence motor aphasia is the result of its interrup- 

 tion. 



(5) The inferior longitudinal fasciculus (fasciculus longit- 

 udinalis inferior, Fig. 74) is about on a level with the lateral 

 ventricle. It passes near the outer wall of the inferior and posterior 

 horns of that ventricle, being separated from them by the occipito- 

 thalamic radiation and the tapetum. It connects the temporal 

 lobe to the occipital. In the temporal lobe its fibers cross at 

 right angles those of the inferior lamina of the internal capsule. 

 This fasciculus unites the auditory and visual psychic centers, and 



