![]() Although the term became widespread, its exact meaning remains imprecise and varies among authors. 7 This term is still used even if the division originally proposed by Sachs 1 is not. The term “sagittal stratum” was adopted by Ludwig and Klingler in their Atlas Cerebri Humani published in 1956. Although advanced for that time, this anatomy needs to be revisited and updated as it was described prior to the development of Klingler’s technique, and far before the description of the inferior fronto-occipital fasciculus (iFOF) and middle longitudinal fasciculus (MdLF). The tapetum, made up of callosal fibers, was not included in the original description. The stratum sagittale internum essentially corresponded to the optic radiations (RADs), whereas the stratum sagittale externum only included fibers of the inferior longitudinal fasciculus (ILF). Sachs described two layers: the stratum sagittale internum and the stratum sagittale externum. ![]() The term “sagittal strata” was employed to name the white matter layers located around the atrium, occipital horn, and callosal fibers. 3, 4 Sachs used several histological techniques and studied fiber degeneration to describe this structure. ![]() ![]() T he first descriptions of the sagittal stratum (SS) by Heinrich Sachs 1, 2 were briefly mentioned by Déjerine in his classic book, Anatomie des Centres Nerveux.
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