✍ Scribed by Thomas H. Alphin; William T. Barnes
No coin nor oath required. For personal study only.
The striae medullares in the floor of t,lie fourth ventricle, evident on gross inspection of the brain, have been regarded by some textbook authors as fibers originating in the acoustic tubercle, passing mesad superficially in the floor of the fourth ventricle and decussating a t the raphe to join the contralateral lateral lemniscus. Although von Monakow many years ago pointed out the difference between the striae mednllares, or striae of Piccolomini, and the true dorsal acoustic stria, confusion in regard to the function and anatomical relationships of these bundles still exists. Barnes, Magoun and Ranson ( '43) have shown that the dorsal acoustic stria of von Monakow which arises in the acoustic tubercle of the monkey does not lie superficially in the floor of the fourth ventricle but is embedded more deeply in the reticular formation of the medulla. This tract decussates and joins the lateral lemniscus of the contralateral side.
The course of the striae medullares (striae of Piccolomini) has been described by D6jerine ( 'Ol), Oberstdner ('Ol), Marburg ( '23), Winkler ( '27) and Jakob ( '28). Although there are differences of opinion as to the exact origin and termination of these fibers, there is unanim-
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