The anatomy of the nervous system, from the standpoint of development and function . by descendingcorticothalamic fibers, which should be included among the efferent projectionsystems, although their physiologic significance is not fully understood. Similar 298 THE NERVOUS SYSTEM efferent fibers are contained in the optic radiation. They arise in the cortexabout the calcarine fissure and terminate in the pulvinar. lateral geniculatebody, and superior colliculus of the corpora quadrigemina (Fig. 162). A corti-coruhral tract descend?- from the frontal lobe through the posterior limb of theintern
The anatomy of the nervous system, from the standpoint of development and function . by descendingcorticothalamic fibers, which should be included among the efferent projectionsystems, although their physiologic significance is not fully understood. Similar 298 THE NERVOUS SYSTEM efferent fibers are contained in the optic radiation. They arise in the cortexabout the calcarine fissure and terminate in the pulvinar. lateral geniculatebody, and superior colliculus of the corpora quadrigemina (Fig. 162). A corti-coruhral tract descend?- from the frontal lobe through the posterior limb of theinternal capsule to end in the red nucleus of the mesencephalon. There do notappear to be any strictly corticostriate fibers, but. according to Cajal (1911),collateral- from the corticospinal fibers are given off to the corpus efferent projection tracts which we have considered all have their origin inthe neopallium. There are several projection tracts from the rhincncephaJon, and of these themost important is the fornix. The fibers of this fascicle take origin in the hip-. Fig. 226.—Some of the important association bundles projected upon the medial aspect of thecerebral hemisphere. (Sobotta-McMurrich.) pocampus, follow an arched course already described, and. entering the dien-cephalon. terminate in part in the mammillary body and in part in the teg-mentum of the brain stem (Fig. 205). The frontal olfactory projection tract arises from the gray matter of the ol-factory peduncle and the lateral olfactory gyrus. It enters the brain stem andterminates in the pons and the medulla oblongata (Fig. 211). Association Fibers.—The various parts of the cortex within each hemisphereare bound together by association fibers of varying length. The short associa-tion fibers are of two kinds: (1) those which run in the deeper part of the cortexand are designated as intracortical, and (2) those just beneath the cortex, whichare known as the subcortical fibers. The greater number of
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