. On retro-peritoneal hernia . nce,an alternative title. In all cases the first title mentioned isin my opinion the aptest, and much perplexity would infuture be avoided if that alone could be accepted. HISTORY OF THE FOSS^. The first mention, so far as I have been able to ascertain,of these fossae is by Hensing (1742) : In initio scilicet jejunimesenterium versus renem sinistrum tendit, atque ascendo,finem mcsocoli transversa partis includit ; antequam verohoc praestat plicam quandam parvam, in qua concavitas latussinistrum, convcxitas vcro latus dextrum respicit, constituit. 2—2 THE DUODENAL
. On retro-peritoneal hernia . nce,an alternative title. In all cases the first title mentioned isin my opinion the aptest, and much perplexity would infuture be avoided if that alone could be accepted. HISTORY OF THE FOSS^. The first mention, so far as I have been able to ascertain,of these fossae is by Hensing (1742) : In initio scilicet jejunimesenterium versus renem sinistrum tendit, atque ascendo,finem mcsocoli transversa partis includit ; antequam verohoc praestat plicam quandam parvam, in qua concavitas latussinistrum, convcxitas vcro latus dextrum respicit, constituit. 2—2 THE DUODENAL FOLDS AND FOSS^ It is no more than a brief allusion, and is, but for itsantiquity, unimportant. Short reference was made to themalso by, among others, Monro, who spoke of a ring, Haller,and Sandifort. The first description of importance, however, is that ofHuschke (1844). He alludes to a triangular fossa at thejunction of the duodenum and jejunum, which opens on theleft side of the lumbar vertebrae, and is bounded above and. Fig. 3.—The Fossa described as Duodeno-Jejunal by Treitz. below by two falciform processes of peritoneum which springfrom the root of the transverse mesocolon. Our knowledgeis, however, chiefly derived from Treitz, whose great workwas published in 1857. Before his time the subject of retro-peritoneal hernia practically did not exist. It was he whofirst recognised that such herniae occur in fossae which arenormal, and it was he who first gave us any intelligentdescription of the fossai and their probable mode of says : If in a body with a normal peritoneum one hfts HISTORY OF THE FOSSM up the great omentum and the transverse colon, and pushesover to the right the mass of small intestines, there will beseen on the left side of the duodeno-jejunal flexure a peri-toneal fold (Fig. 3). This fold varies in shape and frequently it is semilunar, the thin concave edgelooking upwards and to the right, and surrounding thebowel at the level of
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