. Elements of human physiology. Physiology. 628 PHYSIOLOGY or anterior pyramidal tracts. These however also cross gradually in the cord before reaching their final destination— the anterior cornu of the opposite side. The anterior limb of the internal capsule in front of the genu is occupied by the frontal cortical fibres, which are derived from the grey matter of the frontal lobes and which proceed along the innermost portion of the crusta to the pons, where they end, probably in indirect connection with the transverse fibres of the middle peduncle of the cerebellum. Immediately behind the py
. Elements of human physiology. Physiology. 628 PHYSIOLOGY or anterior pyramidal tracts. These however also cross gradually in the cord before reaching their final destination— the anterior cornu of the opposite side. The anterior limb of the internal capsule in front of the genu is occupied by the frontal cortical fibres, which are derived from the grey matter of the frontal lobes and which proceed along the innermost portion of the crusta to the pons, where they end, probably in indirect connection with the transverse fibres of the middle peduncle of the cerebellum. Immediately behind the pyramidal tracts in the posterior limb of the internal capsule is a collection of fibres (the Fio. Transverse section through mid-brain to show position of fillet and pyramid. Anterior corpus quadrigeminum. dV. Descending root of fifth nerve. F. Fillet (I, lateral, and m, mesial fillet). Pyr. Pyramid. Fr. Fibres from frontal lobe to pons. Fibres from occipital lobe to pons. Ne. P'ibres from nucleus caudatus to pons. III. Pioot of third nerve. S. Sylvian iter. Kn. Red nucleus. te7nporo-occi2yital cortical) which run from the temporo- occipital convolutions of the cortex through the internal capsule and along the outer lateral border of the crusta to end in the pons in the same manner as the frontal fibres just described. A fourth constituent of the crusta, which does not appear in the internal capsule, is the small band of fibres derived from the caudate nucleus of the corpus striatum. These firbes seem to end partly in the substantia nigra itself and partly, along with the others of this system, in the pons Varolii. The Tegmental System.—Whereas the pedal system con- sists of fibres which for the most part degenerate downwards. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Starling, Ernes
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