Capsula Extrema
Historical document, translated for reference. It reflects medical knowledge of the 1920s–30s and is not medical advice.
Summary
The Capsula Extrema is a narrow band of white matter located between the claustrum and the insula cortex in the cerebral hemispheres. It contains association, commissural, and projection fibers similar to the external capsule, including the uncinate fasciculus and anterior commissure.
Encyclopedia entry (1928–1936)
CAPSULA EXTREMA (extreme capsule or sheath), a formation located in the cerebral hemispheres and appearing as a narrow band of white matter situated between the claustrum internally and the cortex of Reil's insula externally (see separate table, figures 1-3). It consists of association, commissural, and projection fibers belonging to the same systems as the fibers of the external capsule, mainly the uncinate fasciculus and the anterior white commissure. In addition, the C. e. contains a large number of short association fibers connecting the gyri of Reil's insula with both nearby and more distant ones. The blood supply and functional significance are the same as those of the external capsule. It is always affected simultaneously with the external capsule, and therefore the symptomatology of diseases of the extreme capsule has not been distinguished (see External Capsule).
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“Capsula Extrema.” Soviet Medical Encyclopedia. English translation of Bolshaya Meditsinskaya Entsiklopediya, 1st ed. (Moscow, 1928–1936), ed. N. A. Semashko. https://sovietmedicalencyclopedia.pages.dev/article/capsula-extrema/