Human anatomy, including structure and development and practical considerations . uadrigemina, the red nucleus and thecerebellum.. Diaijram sbdwinj^ chief coiistiluetilsof posterior longitudinal fasciculus. III.I, VI, II, XII, nuclei of respectivenerves; DN, vestibular (Deiters) nu-cleus; CN, common nucleus of posteriorcommissure and posterior longitudinalfasciculus. DEVELOPMENT OF THE MESENCEPHALON. Of the three primary cerebral vesicles, the mid-brain undergoes least change. Althoughmuch smaller than either of the other segments of the brain-tube, its prominent position, lyingas it does at

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Human anatomy, including structure and development and practical considerations . uadrigemina, the red nucleus and thecerebellum.. Diaijram sbdwinj^ chief coiistiluetilsof posterior longitudinal fasciculus. III.I, VI, II, XII, nuclei of respectivenerves; DN, vestibular (Deiters) nu-cleus; CN, common nucleus of posteriorcommissure and posterior longitudinalfasciculus. DEVELOPMENT OF THE MESENCEPHALON. Of the three primary cerebral vesicles, the mid-brain undergoes least change. Althoughmuch smaller than either of the other segments of the brain-tube, its prominent position, lyingas it does at the summit of the cephalic flexure, makes it conspicuous in the early developingbrain. During the enormous expansion upward and backward incident to the developmentof the cerebral hemispheres in man, the mid-brain becomes covered in and deposed to adependent position and a relatively small size. For a time possessing a spacious cavity, it failsto keep pace with the growth of the adjoining parts ; its walls thicken and its lumen becomeseventually reduced to the narrow Sylvian aqueduct. iii8 HLMAN ANATOMY. The dorsal zones of