. Cunningham's Text-book of anatomy. Anatomy. THE DEEP CONNEXIONS OF THE CEEEBEAL NEEYES. 607 lemniscus. It is important to remember that the strife mechillares are not always visible in the floor of the fourth ventricle (Fig. 535), but are often buried more or less deeply. The connexion between the terminal cochlear nuclei and the inferior colliculus is not altogether with that of the opposite side, as the foregoing description and the diagram (Fig. 534) might lead one to infer. A few fibres pass directly to the inferior colliculus of the same side, but none to the corresponding medial genicu
. Cunningham's Text-book of anatomy. Anatomy. THE DEEP CONNEXIONS OF THE CEEEBEAL NEEYES. 607 lemniscus. It is important to remember that the strife mechillares are not always visible in the floor of the fourth ventricle (Fig. 535), but are often buried more or less deeply. The connexion between the terminal cochlear nuclei and the inferior colliculus is not altogether with that of the opposite side, as the foregoing description and the diagram (Fig. 534) might lead one to infer. A few fibres pass directly to the inferior colliculus of the same side, but none to the corresponding medial geniculate body : the connexion with the latter is entirely crossed (Ferrier and Turner). From the medial geniculate body there proceeds a tract to the cerebral cortex of the transverse temporal gyri (Heschl's). The whole nervous apparatus is thus linked on to the cerebral cortex, and the succession of neurones which build up the entire chain are therefore: (1) in the cochlea of the internal ear, the bipolar cells of the spiral Lateral ventricle Nucleus caudatus \ Corona radiata \ Corpus callosum Internal capsule Claustrum Thalamo-cerebral (sensory) radiation in internal capsule. Insula Auditory radiation enter- ing transverse temporal gyri Ventro-lateral thalamic nuclei receiving the medial lemniscu and emitting sensory fibres to the cortex " Auditory radiation Lateral geniculate body receiving lateral lemniscus an emitting auditory radiation Lateral ventricle inferior corn Medial geniculate body Fimbria Hippocampus Lateral lemniscus Medial lemniscus at the part where the spinothalamic and bulbo- thalamic tracts join Thalamus (nucleu lateralis) Basis pedunculi-' cerebri Substantia nigra Cerebro-spinal and cerebro-pontine tracts in the pons Nervus acusticus Corpus trapezoideum Pyramid-—' Decussation of pyramids Ventral cerebro-spinal tract Fig. 537.—A Vertical Tbabtsverse Section of the Brain to show the Whole of the Central Acoustic Path. The left hemisphere (right side of
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