Un manuel d'anatomie . s précédemment mentionné se compose des fibres cochléaires ventrales et des cellules nerveuses comprenant le noyau de L'ANATOMIE INTERNE DU CERVEAU MÉDIAN 405 le lemniscus latéral, Apparemment une continuation cf l'olive supérieure.Ici certaines des fibres de l'extrémité du lemniscus et de nouvelles sont issues des cellules du noyau et continuent, à la fin dans le corps inférieur de quadriculate de quadriculine et peut-être dans le supérieur quadrigeminum. La zone médiane dorsale du formatio reticularisis occupé par le fascicule longitudinal tnédien. Dorsal à cet aréais le su gris ventriculaire

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A manual of anatomy . s previously mentioned consists ofthe ventral cochlear fibers and nerve cells comprising the nucleus of THE INTERNAL ANATOMY OF THE MIDBRAIN 405 the lateral lemniscus, apparently a continuation cf the superior olive.Here some of the fibers of the lemniscus end and new ones arise fromthe cells of the nucleus and continue, to end in the inferior quadri-geminum and medial geniculate body and possibly in the superiorquadrigeminum. The dorsal median area of the formatio reticularisis occupied by the tnedian longitudinal fasciculus. Dorsal to this areais the ventricular gray substance. In this section the fourth ventricleis small and entirely roofed over by the valvula that contains alittle nerve tissue. At the lateral boundary of the ventricular grayis noted the mesencephalic root of the trigeminal nerve. THE MIDBRAIN In this portion of the brain stem two sections will be described, one through the inferior quadrigeminal bodies and the other at thelevel of the superior quadrigeminal bodies.. Fig. 292, —Transverse section of the midbrain through the inferior quadrigemina! tn^dieSn The section through the inferior bodies shows a marked changeover the preceding sections. Ventrally are seen the two crura cerebri(pedunculi cerebri) separated from each other by the interpeduncularspace. Each cms consists of a ventral area called the crusta (basispedunculi) containing only motor fibers in three groups: (i) thelateral one-fifth consisting of fibers from the cortex of the temporallobe of the cerebrum to the nuclei pontis and called the temporo-pontile tract; (2) the middle three-fifths consists of the fibers from thepyramidal cells of the motor area of the frontal lobe passing to thecerebral nerve nuclei and to the spinal cord constituting the pyram-idal tract previously mentioned; (3) the medial one-fifth consist offibers from the cells of the frontal lobe passing to the nuclei pontisand called the frontopontile tract. Dorsally the crusta is boundedby a cre

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