A text-book of physiology for medical students and physicians . Fig. 91.—Cross-section through midbrain (Kolliker) to show the position of the lemniscus(L, L): Nr, The red nucleus; Sn, the substantia nigra; Fp, the peduncle. by the sensory fibers in the cord, especially those of the pos-terior funiculi, after ending in the nucleus of the funiculus gra-cilis and the nucleus of the funiculus cuneatus of the path is represented in a schematic way in the accompanyingdiagram (Fig. 90). The second sensory neurons arise in thenuclei mentioned. For the most part, at least, these new neu-r
A text-book of physiology for medical students and physicians . Fig. 91.—Cross-section through midbrain (Kolliker) to show the position of the lemniscus(L, L): Nr, The red nucleus; Sn, the substantia nigra; Fp, the peduncle. by the sensory fibers in the cord, especially those of the pos-terior funiculi, after ending in the nucleus of the funiculus gra-cilis and the nucleus of the funiculus cuneatus of the path is represented in a schematic way in the accompanyingdiagram (Fig. 90). The second sensory neurons arise in thenuclei mentioned. For the most part, at least, these new neu-rons run ventrally, as internal arcuate fibers, cross the mid-line,and then pass forward or anteriorly. The crossing occurs mainlyjust in front of—-that is, cephalad to—the pyramidal decussa-tion, forming thus a sensory decussation (decussation of thelemniscus), which explains the crossed sensory control, as thepyramidal decussation explains the crossed motor control ofthe cerebrum in relation to the body. After this decussation 204 PHYSIOLOGY OF CENTRAL
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