. On retro-peritoneal hernia : being the 'Arris and Gale' lectures on the 'The anatomy and surgery of the peritoneal fossae' : delivered at the Royal College of Surgeons of England in 1897. when sharply defined,may be more distinct than the ileo-colic fold with which itco-exists. Its surfaces are anterior and posterior, the latterbounding the accessory ileo-colic fossa. This fold has escaped the observation of all previouswriters. THE ILEO-COLIC FOSSA 85 The Ileo-Colic Fossa—Anterior Vascular Fossa—Fossa ofLuschka (Superior ileo-ccecal fossa, Waldeyer, Treves, Hart-mann, Tuffier ; recessus ile
. On retro-peritoneal hernia : being the 'Arris and Gale' lectures on the 'The anatomy and surgery of the peritoneal fossae' : delivered at the Royal College of Surgeons of England in 1897. when sharply defined,may be more distinct than the ileo-colic fold with which itco-exists. Its surfaces are anterior and posterior, the latterbounding the accessory ileo-colic fossa. This fold has escaped the observation of all previouswriters. THE ILEO-COLIC FOSSA 85 The Ileo-Colic Fossa—Anterior Vascular Fossa—Fossa ofLuschka (Superior ileo-ccecal fossa, Waldeyer, Treves, Hart-mann, Tuffier ; recessus ileo-ccecalis anterior, Brosike ; anteriorileo-ccecal or pre-ileal fossa, Jonnesco ; ileo-colic fossa, Lock-wood and Rolleston, Kelynack, Berry).—This is a narrowfossa, or chink, situated between the ileo-colic or anteriorvascular fold in front, and the enteric mesentery, ileum, anda small portion of the upper and inner part of the caecum,behind. In size and depth the fossa is liable to considerablevariation. In the young it is well marked ; but in later life,owing to the increase in size of the caecum, which is chieflyin the transverse direction, and to the invasion of the ileo-. Fig. 27.—The Ileo-Colic Fossa and the Accessory Ileo-Colic Fossa. colic angle with fat, the fossa may become very small, andeven disappear. Externally, it is limited by the attachmentof the anterior vascular fold; the orifice of the fossa isdirected internally to the left. When the ileo-colic artery is continued down into themesentery of the appendix—when, that is, the meso-appendixis derived from, and is continuous with, the ileo-colic fold —the ileo-colic fossa is very considerably increased in size; onsection it would then appear to be triangular in form, beingbounded in front by the ileo-colic fold and its continuationinto the meso-appendix, below by the intermediate non- 86 THE CJECUM AND VERMIFORM APPENDIX vascular fold, and behind by the ileum and a small portion ofthe enteric mesenter
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