Archive image from page 603 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( 570 THE NEEVOUS SYSTEM. matter of the floor of the ventricle, is the collection of pigmented cells which con- stitutes the substantia ferruginea. The medial longitudinal bundle, as it is traced upwards through the tegmental part of the pons, maintains the same position throughout, and as it ascends it becomes more clearly mapped out as a definite and distinct tract. It lies close to the median raphe, and immediately subjacent to the gray matter of the
Archive image from page 603 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( 570 THE NEEVOUS SYSTEM. matter of the floor of the ventricle, is the collection of pigmented cells which con- stitutes the substantia ferruginea. The medial longitudinal bundle, as it is traced upwards through the tegmental part of the pons, maintains the same position throughout, and as it ascends it becomes more clearly mapped out as a definite and distinct tract. It lies close to the median raphe, and immediately subjacent to the gray matter of the floor of the fourth ventricle. The lemniscus medialis, as it ascends through the tegmental part of the pons, undergoes striking changes in shape. In the lower portion of the pons its fibres, which in the medulla oblongata are spread out along the side of the median raphe, are collected together in the form of a loose bundle, which occupies a wide field, somewhat triangular in shape, on either side of the median raphe and immediately behind the basilar portion of the pons. As it proceeds up, the fibres spread out laterally until a compact ribbon-like layer is formed in the interval between the tegmental and basilar portions of the pons (Figs. 501 and 502). Above the level of the trigeminal nuclei another flattened layer of fibres comes Upper end of fourth ventricle Trochlear nerve Mesencephalic root of trigeminal nerve Fasciculus anterolateralis superficialis Medial longitudinal, bundle Brachium conjunctivum — Lateral lemniscus / a Formatio reticulari: Medial lemniscus Inferior quadri- geminal body -, Decussation' [- of trochlear ' nerves Upper end of fourth ventricle Brachium conjunctivum Medial longi- tudinal bundle Lateral lemniscus Medial lemniscus A B Fig. 502.—Two Sections through the Dorsal Portion of the Pons at its Superior Part, CLOSE TO THE MESENCEPHALON. A is at a slightly lower level than B. into view to the lateral side of the lemniscus medialis. To this the
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