Darkshevich's Nucleus
Historical document, translated for reference. It reflects medical knowledge of the 1920s–30s and is not medical advice.
Summary
Darkshevich's nucleus is located in the midbrain region near the cerebral aqueduct. Initially considered part of the oculomotor nerve nucleus, later research shows it's actually associated with the posterior commissure and posterior longitudinal fasciculus, though its exact anatomical connections and physiological significance remain unclear.
Encyclopedia article (1928–1936)
Darkshevich's nucleus, located in the area of the midbrain (mesencephalon), on both sides of the aqueduct of Sylvius, and was
Section through the midbrain and diencephalon: 1-nucleus of Darkshevich, or nucleus of commissura posterior; 2-commissura posterior; 3-fasciculus longitudinalis posterior; i-III ventricle; a-pineal body; b-ganglion habenulae; 7-pulvinar; 8-nucleus thalami optici; 9-nucleus arcuatus; 10-base of cerebral peduncle; 11-nucleus ruber; 12-corpus Luysi; 13-corpus mamillare. (From Marburg.)
considered by the author as the 'superior nucleus of the oculomotorius'. Recent research has shown that it has no relation to the third pair of cranial nerves, and most authors consider it to be the nucleus of the 'commissurae albae posterioris' and the nucleus of the 'fasciculus longitudinalis posterioris' (see figure), since the descending fibers of this bundle begin in it; it is assumed that the axons of the cells of this nucleus, upon exiting, divide into two parts, one of which goes to the commissura alba posterior, and the other to the fasciculus longitudinalis posterior; the fibers do not cross. Some authors disagree with this opinion and attribute the beginning of the commissurae albae posterioris and fasciculus longitudinalis posterioris to other formations (corpora quadrigemina and nucleus interstitialis). Due to the unclear anatomical connections of D. n., its physiological significance is also unclear.
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“Darkshevich's Nucleus.” Soviet Medical Encyclopedia. English translation of Bolshaya Meditsinskaya Entsiklopediya, 1st ed. (Moscow, 1928–1936), ed. N. A. Semashko. https://sovietmedicalencyclopedia.pages.dev/article/darkshevich-nucleus/