124 FLORENCE R. SARIN 



stations in the basal ganglia, the venti'o-lateral nucleus of the 

 thalamus and the globus pallidus of the lenticular nucleus. The 

 paths are first the medial lemniscus. The medial lemniscus 

 is the indirect continuation of the posterior columns of the cord. 

 It arises in the medulla from two bundles of crossed fibres, one 

 from the nucleus of the fasciculus gracilis and the other from the 

 nucleus of the fasciculus cuneatus." It passes through the pons 

 without giving off any bundles; in the mid-brain, it gives fibres 

 to the substantia nigra, and the superior colliculus ; in the thalamus 

 it ends in the center median of Luys the cup-shaped nucleus and the 

 ventro-lateral nucleus of the thalamus. Secondly, there are two sys- 

 tems of medullated tracts which connect the inner division of the 

 globus pallidus with lower centers. One of these systems of fibres 

 may be connected with the cerebellum, since the inferior cerebel- 

 lar peduncle or corpus restiform is partly medullated, connecting 

 the cord and the cerebellum, the superior cerebellar peduncle or 

 brachium conjunctivum is medullated connecting the cerebellum 

 v/ith the red nucleus, and Forel's lenticular fasciculus seems to con- 

 nect the red nucleus with the globus pallidus . The second connection 

 of the inner part of the globus pallidus is by the tract making a 

 capsule for the hypothalamic nucleus of Luys which is also con- 

 nected with the medial lemniscus. Thus the model shows two 

 nuclei as relay stations for cortical paths the medial part of 

 the ventro-lateral nucleus of the thalmus, which is known to be a 

 relay station in a sensory path, and the medial part of the first 

 division of the globus pallidus which is, however, not so definitely 

 known as a part of a sensory path. Flechsig regards this lenticu- 

 lar cortical path as ascending. ^^ The cortical radiation as far 

 as it is medullated at birth comes from these same two nuclei, 

 but from their lateral portion. Thus there is a medullated bundle 

 between the lateral part of the lateral nucleus (no. 26) of the thala- 



" The decussating bundle from the sensory nucleus of the trigeminus is not 

 present in this sorios. It was shown in my first model lying in the floor of the fourth 

 ventricle just cerebralward to the nucleus n. absducentis. It was searched for with 

 great care in the present series since Lewandowsky, in the Neurobiologischc 

 Arbeiten, herausgegeben von Oskar Vogt, Erster Band, Zweite Lieferung, 1904, 

 page 93, has shown its importance as making the third bundle to form the lemniscus 

 medialis. 



" Flechsig, Archiv. f. Anat. u. Phys., Anat. Ablh. 



