. The brain of the tiger salamander, Ambystoma tigrinum. Brain; Ambystoma. 330 THE BRAIN OF THE TIGER SALAMANDER Figure 16.—Diagram of the chief afferent tracts to the ventral thalamus (p. 239). Figure —Diagram of the chief efferent tracts from the ventral thalamus (p. 240). Figure 18.—Diagram of the chief connections of the "peduncle" (nucleus of the tuberculum posterius, pp. 50, 217). Many shorter connections are omitted. For the connections of the ventrolateral neuropil see chapter iii and figure 23. Figure 19.—Diagram of the diencephalic connections of the amygdala (pp. 52, 2
. The brain of the tiger salamander, Ambystoma tigrinum. Brain; Ambystoma. 330 THE BRAIN OF THE TIGER SALAMANDER Figure 16.—Diagram of the chief afferent tracts to the ventral thalamus (p. 239). Figure —Diagram of the chief efferent tracts from the ventral thalamus (p. 240). Figure 18.—Diagram of the chief connections of the "peduncle" (nucleus of the tuberculum posterius, pp. 50, 217). Many shorter connections are omitted. For the connections of the ventrolateral neuropil see chapter iii and figure 23. Figure 19.—Diagram of the diencephalic connections of the amygdala (pp. 52, 248) and of some of the connections of the interpeduncular nucleus (chap. xiv). Figiire 20.—Diagram of the connections of the habcnula. In the stria medullaris thalami the components are arranged in the fore-and-aft order in which they ascend, as also are the. decussations in the habenular commissure (compare the horizontal sections, figs. 25-36). Efferent fibers from the habenida enter three tracts (,, and ). The afferent fibers are numbered as in the analysis of the stria medullaris in chapter xviii: 1. Tr. olfacto-habenularis medialis 2. Tr. olfacto-habenularis lateralis 3. Tr. olfacto-habenularis anterior, ventral division 4. Tr. olfacto-habenularis anterior, dorsal division 5. Tr. cortico-habenularis lateralis 6. Tr. amygdalo-habenularis 7. Tr. septo-habenularis 8. Tr. cortico-habenularis medialis 9. Tr. cortico-thalamicus medialis 10. Tr. olfacto-thalamicus 11. Tr. thalamo-habenularis 12. Tr. tecto-habenularis Not shown in this figure is the tr. pretecto-habenularis and a probable tr. strio-habenularis. Figure 21.—Diagram of the chief afferent connections of the tegmentum isthmi (p. 179). Most of the tracts here indicated end in both the isthniic and the trigeminal tegmentum. For the connections of the interpeduncular nucleus and its neuropil see chapter xiv. Figure 22.—Diagram of the most direct connections between the retina and t
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