. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 367 runs ventro-niesially through the mesial thickening of the granular layer, curves down behind the velar and trochlearis decussations and enters the tectum mesial to the first and second bundles. After enter- ing the tectum the fibers of the tract are spread in small bundles through the whole width of the tectum and continue straight forward. The bundles lie in the outer part of the central cellular zone and beneath the fiber zone of the tectum. Occasionally small fasciculi or single fibers separate from the bundles and be
. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 367 runs ventro-niesially through the mesial thickening of the granular layer, curves down behind the velar and trochlearis decussations and enters the tectum mesial to the first and second bundles. After enter- ing the tectum the fibers of the tract are spread in small bundles through the whole width of the tectum and continue straight forward. The bundles lie in the outer part of the central cellular zone and beneath the fiber zone of the tectum. Occasionally small fasciculi or single fibers separate from the bundles and bend upward into the fiber zone. Since these fibers are much coarser than any others in the tectum they could be easily followed in the fiber zone, but in fact they are quickly lost, sometimes after being traced a short distance toward the median line. They probably lose their sheaths upon enter- ing the fiber zone and soon end. Only a few of the most mesial. tctecto-csr. S/Bindcatm ' Fig. 3. Fig. 4. The figures are all drawn with the camera, Fig. 5 at a higher magnification than the others. Fig. 1—4. Transverse sections through the region of the cerebellum and velum of Scyllium canicula. Fig. 1 is the most caudal section drawn; one section intervenes between it and Fig. 2, two sections between Figs. 2 and 3, and two sections between Figs. 3 and 4. The cleft between the cerebellum and tectum in which the trochlearis runs is drawn in black. a. a bundle of fine medullated fibers which run from the cerebellum through the n. b. M. and decussate mesial to the f. I. d. c. cerebellum, c. c. cerebellar commis- sure of fine fibers belonging to the molecular layer. The dotted line indicates the line of separation of granular and molecular layers. The same commissure appears at the top of the Figs. 1—4, where medullated fibers reach it. dec. v. decussatio veli. fasciculus longitudinalis dorsalis. n. b. M. that portion of the central grey which is in continuity with the
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