GANGLIONAR GRAY MATTER. 



215 



form nucleus, where it probably terminates; but the conduction 

 path to which it belongs is continued to the upper third of the 

 posterior central and the paracentral gyri by the alpha and gamma 

 bundles of Flechsig. The lower lamina of the ventral stalk, the 

 inferior peduncle, runs principally into the external capsule medial 

 to the claustrum, but a part of it dips under the claustrum. It 

 terminates in the temporal lobe and the island, (b) The superior 



Fig. 68. Section of the mid-brain through superior colliculi and the apparent 

 origin of the oculomotor nerve. (Original.) 



a. Sulcus laternlis of/mid-brain. b. Red nucleus, c. Medial longitudinal bundle, d. Oculo- 

 motor nucleus, e. Stratum griseum centrale. f. Colliculus superior of corpora quadrigemina. 

 g. Formatio reticularis. h. Medial fillet, i. Medial geniculate body. j. Optic tract, k. Basis 

 pedunculi. 1. Dorsal tegmental decussation (Meynerti). m. Ventral tegmental decussation 

 (Foreli). n. Fossa interpeduncularis. o. Substantia nigra. p. Fronto-pontal tract, q. ad. N. 

 r. Pyramidal tract, s. Intermediate tract, t. Temporo-pontal tract. 



group of fibers that issues from the lateral surface of the thala- 

 mus is the parietal stalk (Fig. 70). It rises from the lateral nucleus 

 and traverses the superior lamina of the internal capsule. To 

 a slight extent it is probably relayed in the lentiform nucleus. 

 It terminates in the posterior central gyms and in the paracentral 

 lobule. This parietal stalk, in the upper limits of the internal 

 capsule, contains nearly all of the common sensory fibers going 



