. Cunningham's Text-book of anatomy. Anatomy. 568 THE NERVOUS SYSTEM. Upon the medial and dorsal aspect of the superior olive there is a dense group of longitudinal fibres. These constitute the fasciculus thalamo-olivaris or central tegmental tract, to which we have already referred in discussing the inferior olivary nucleus (Fig. 498). It is uncertain whether this tract arises in the thalamus. (4) The medial longitudinal bundle and the lemniscus medialis come next. As they proceed upwards through the tegmental part of the pons, these longitudinal tracts occupy the same relative position as in
. Cunningham's Text-book of anatomy. Anatomy. 568 THE NERVOUS SYSTEM. Upon the medial and dorsal aspect of the superior olive there is a dense group of longitudinal fibres. These constitute the fasciculus thalamo-olivaris or central tegmental tract, to which we have already referred in discussing the inferior olivary nucleus (Fig. 498). It is uncertain whether this tract arises in the thalamus. (4) The medial longitudinal bundle and the lemniscus medialis come next. As they proceed upwards through the tegmental part of the pons, these longitudinal tracts occupy the same relative position as in the medulla oblongata. They are placed close to the median raphe; but they have drawn further apart from each other, and their fibres are more distinctly concentrated into separate strands, with an interval of some little width between them, which is occupied by the tecto-spinal tract. The medial longitudinal bundle lies immediately under cover of the gray Braehium conjunctivum Anterior medullary velum Mesencephalic root of the trigeminal nerve Motor nucleus of the trigeminal nerve Motor root of the trigeminal nei ve Sensory nucleus of the trigeminal nerve Superior olive Sensory root of trigeminal nerve Braehium ponti;. Pyramidal bundles Fig. 500.—Transverse Section through the Pons at the Level of the Nuclei of the Trigeminal Nerve (Orang). matter of the floor of the fourth ventricle. The lemniscus medialis is placed close to the trapezial fibres, many of which traverse it as they pass towards the median plane. (5) The nucleus of the abducens nerve also forms a conspicuous object in sections through the lower part of the pons. It is a round mass of gray matter, which is situated close to the lateral side of the medial longitudinal bundle, and immediately under cover of the gray matter of the floor of the fourth ventricle. From its medial side numerous root-bundles of the abducens nerve pass out and proceed forwards between the lemniscus medialis and the superior olivary nuc
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