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Figs. 24 and 25 Cross-sections through the auricular lobe of the brain, show- 
ing the internal distribution of the radix mesencephalica V, its relation to the cere- 
bellar commissure and to the trochlear nerve. X50. Compare with figures 20 to 
23, 26, 27. . 
Fig. 24 Shows ventrally the entrance of the radix into the brain; dorsally the 
cerebellar commissure, the trochlearis and the lateral part of the radix (Vrml.). 
Fig. 25 The radix is joined by fibers of the tractus tecto-bulbaris et spinalis 
(tbs.) ventrally; dorsally the radix is seen divided into medial (Vrm.) and lateral 
(Vrml.) portions. 
267 
