PALLIDOHYPOTHALAMIC TRACT, OR X BUNDLE OF MEYNERT, IN THE RHESUS MONKEY

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Abstract
The term pallidohypothalamic tract was used by Bard and Rioch (1937)1 to designate a bundle of well myelinated fibers which they observed leaving the main bundle of pallidofugal fibers and running into the hypothalamus, to end, or at least to lose their myelin sheaths, in the region of the ventromedial hypothalamic nucleus. These observations were made on a decorticate cat from which the corpus striatum had not been removed. The origin from the corpus striatum of the bundle in question was shown by its degeneration in another decorticate cat, in which the corpus striatum was destroyed along with the cortex. Various terms have been applied to this bundle, and it will serve to avoid confusion if the synonyms are listed here. The pallidohypothalamic tract has been described under that name by Papez,2 and by Ranson and Ranson3; and as the hypothalamic fasciculus by Krieg4; hypothalamic tegmental