. The brain of the tiger salamander, Ambystoma tigrinum. Brain; Ambystoma. 350 THE BRAIN OF THE TIGER SALAMANDER Figure 55.—Detail of the spiral course of fibers of the f. retroflexus below the decussation, from a horizontal Golgi section of a late larva. X 50. In the interpeduncular neuropil nothing but these three fibers is impregnated, so there is no possibility of confusion. Figures 56, 57, —Three horizontal Golgi sections of an adult brain, in which the right f. retroflexus is unstained and the left fasciculus is abundantly impregnated from the habenula to its decussation. X 50. Some
. The brain of the tiger salamander, Ambystoma tigrinum. Brain; Ambystoma. 350 THE BRAIN OF THE TIGER SALAMANDER Figure 55.—Detail of the spiral course of fibers of the f. retroflexus below the decussation, from a horizontal Golgi section of a late larva. X 50. In the interpeduncular neuropil nothing but these three fibers is impregnated, so there is no possibility of confusion. Figures 56, 57, —Three horizontal Golgi sections of an adult brain, in which the right f. retroflexus is unstained and the left fasciculus is abundantly impregnated from the habenula to its decussation. X 50. Some details of the decussation are added to figure 58 from the section adjoining it ventrally. The impregnation fails spinalward of the decussation. The left fasciculus shows an atypical division into two bundles as it enters the alba of the peduncle (p. 262). Figure —An obliquely horizontal section through the superficial origins of the III roots, advanced larva. X 50. Here it is in about the plane of figure 30, but sharply inclined to the horizontal plane, with the posterior end more ventral and the anterior end more dorsal than that level. Impregnated fibers of the olfacto-peduncular tract pass the region of the fovea isth-. mi and then turn medially. Most of them end in the interpeduncular neuropil with open arborizations, though some extend farther spinalward (compare figs. 53, 54). From this neu- ropil slender axons of the dorsal interpedunculo-bulbar tract descend near the mid-plane and soon turn laterally to end in a dense axonic neuropil at the ventral border of the caudal end of the tegmentum isthmi and rostral end of the tegmentum trigemini. Here they engage dendrites of the smaller neurons of this region. Other preparations show that some of these fibers extend spinalward as far as the IX nerve roots. Figures 60 to 6^.—These drawings present additional details from a series of transverse Golgi sections (no. 2246), which has already been quite fully described
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