. The brain of the tiger salamander, Ambystoma tigrinum. Brain; Ambystoma. 3^8 THE BRAIN OF THE TIGER SALAMANDER the same plane. The arrangement of the fascicles of nerve root fibers is indicated. Neuron 1 is in synaptic relation with all components of these cranial nerves. Neuron 2 makes its chief connection with visceral-gustatory fibers of the f. solitarius and less intimate connection with vestibular and trigeminal fibers. Neuron 3 connects only with root fibers of the trigeminus. Neuron 4 connects with the trigeminus and also with the reticular formation and motor zone. Similar elements h
. The brain of the tiger salamander, Ambystoma tigrinum. Brain; Ambystoma. 3^8 THE BRAIN OF THE TIGER SALAMANDER the same plane. The arrangement of the fascicles of nerve root fibers is indicated. Neuron 1 is in synaptic relation with all components of these cranial nerves. Neuron 2 makes its chief connection with visceral-gustatory fibers of the f. solitarius and less intimate connection with vestibular and trigeminal fibers. Neuron 3 connects only with root fibers of the trigeminus. Neuron 4 connects with the trigeminus and also with the reticular formation and motor zone. Similar elements have been seen to connect also with fascicles of the VIII and other nerve roots. Axons of all these types decussate in the ventral commissure and may ascend in the general bulbar lemniscus. The axon of neuron 2 divides, one branch ascending in the secondary visceral tract {) of the same side and the other crossing to the opposite side. Some similar neurons connect only with the f. solitarius and have unbranched axons entering only. Numberless permutations of the various types of connection here shown have been observed. olfoctory bulb fasc. erebelL Figure 10.—Diagram of the chief aflFerent connections of the body of the cerebellum and of the brachium conjunctivum seen as projected on the median section of the brain (chaps. iv and xii). X 18. The more lateral vestibular connections are not drawn. The outline is that of figure 2C, and dotted lines mark ventricular sulci and the boundaries of the chief sub- divisions of the brain wall. Figure 11.—Diagram of the chief afferent tracts to the tectum (pp. 48, 220). Figure 12.—Diagram of the chief efferent tracts from the tectum. Many shorter connec- tions are omitted (p. 223). Figure IS.—Diagram of the connections of the mesencephalic nucleus of the V nerve and of some tecto-bulbar and tegmento-bulbar tracts probably concerned with feeding reflexes (p. 140). Figure H.—DiagTaxn of the chief afferen
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