The anatomy of the nervous system, from the standpoint of development and function . t course (Wallenberg, 1905; Economo, 1911; Dejerine, 1914). Neuron III.—The afferent impulses are relayed from the thalamus to thecortex of the posterior central gyrus by fibers of the third order, which run throughthe posterior limb of the internal capsule. Their cells of origin are located inthe lateral nucleus of the thalamus. THE GREA1 \l I I K l \ l SYSTEMS .W) The Neural Mechanism for Hearing. The spiral organ of Corti within thecochlea is connected with the auditory center in the cerebral cortex l>\
The anatomy of the nervous system, from the standpoint of development and function . t course (Wallenberg, 1905; Economo, 1911; Dejerine, 1914). Neuron III.—The afferent impulses are relayed from the thalamus to thecortex of the posterior central gyrus by fibers of the third order, which run throughthe posterior limb of the internal capsule. Their cells of origin are located inthe lateral nucleus of the thalamus. THE GREA1 \l I I K l \ l SYSTEMS .W) The Neural Mechanism for Hearing. The spiral organ of Corti within thecochlea is connected with the auditory center in the cerebral cortex l>\ a chain of three or more units. Neuron I. The bipolar cells of the spiral ganglion within the cochlea send each a peripheral process to end in the spiral organ of Corti. Ku< h -end- a < entralbranch to ramify in the cochlear nuclei, where it forms synaptic connectionswith the auditor) neurons of the second order (Fig. 233). Transverse temporal ^yrus 1 Auditory radiation Medial geniculate bodyInferior colliculus - Lateral lemnisci Collaterals to nucleus oflateral lemniscus. Roslral portion of the pons ,Stri<e medullares Dorsal cochlear nucleus Ventral cochlear nucleusCochlear nerveVestibular nerve Caudal portion of the pons Superior olive Trapezoid body Nucleus of the trapezoid body Fig. 233.—Diagram of the auditory pathway. (Based on the researches of Cajal and Kreidl.) Neuron II.—The cells located in the ventral and dorsal cochlear nuclei giverise to fibers, which after crossing the median plane form the lateral lemniscusof the opposite side. Those from the ventral cochlear nucleus cross the pons inthe trapezoid bod}-, giving off collaterals to the superior olivary nuclei and thenuclei of the corpus trapezoideum. and may be joined by fibers taking origin inthese nuclei. Lateral to the contralateral superior olivary nucleus they turnabruptly rostrad in the lateral lemniscus. The fibers from the dorsal cochlearnucleus run in the striae medullares of the fourth ven
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