This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 Excerpt: ...decussation can be followed through the series of sections as far as the thalamus. In the lower part of the medulla oblongata these fibers will be found in the interolivary space near the median plane (Herrick ('18), Figs. 64, 72, 73). They are bounded ventrally by the cortico-spinal (pyramidal) tract, and dorsally by ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 Excerpt: ...decussation can be followed through the series of sections as far as the thalamus. In the lower part of the medulla oblongata these fibers will be found in the interolivary space near the median plane (Herrick ('18), Figs. 64, 72, 73). They are bounded ventrally by the cortico-spinal (pyramidal) tract, and dorsally by the tectospinal tract. Dorsally of the latter is the longitudinal medial fasciculus. At the level of the pons the medial lemniscus begins to turn laterally and in the midbrain it lies dorsally of the substantia nigra (Herrick ('18), Fig. 75). In sections through the midbrain and thalamus these fibers can readily be followed forward to their termination in the lateral and associated somesthetic nuclei of the thalamus (Herrick ('18), Figs. 77, 78, and 79). The medial lemniscus carries general proprioceptive nervous impulses from the spinal cord to the thalamus. Identify the medial lemniscus in the sections and draw it into the outlines as far forward as the material provided will permit. See, in addition to the figures cited in the previous paragraph, Section 62 (1) to (11); Cunningham ('15), Fig. 579, p. 651; Morris ('14), Fig. 632, p. 803; Piersol ('16), Fig. 964; Sabin ('01), Plates V, VII; Spalteholz ('09), Fig. 752, p. 675; Villiger ('12), Figs. 154, 155, pp. 167, 168. Directions for the dissection of the medial lemniscus of man will be found in Section 108. 78. The spinal lemniscus.--The ascending secondary pathway for exteroceptive sensibility (touch, temperature, pain) from the trunk and limbs is the spinal lemniscus, or spinothalamic tracts. There are two of these tracts in the cord, the tractus spino-thalamicus dorsalis for pain and temperature, and the tractus spino-thalamicus ventralis for touch and pressure (Herrick ('18), Fig. 63)....
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