Archive image from page 1247 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( The interior of the caecum corresponds in general appearance to that of the large intestine; but it presents two special features on the posterior part of its medial wall, namely, the ileo-csecal orifice, guarded by the valvula coli ( ileo- cecal valve), and below this the small opening of the processus vermiformis, both of which call for further notice. Valvula Ooli ( Ileo-csecal Valve).—Where the ileum enters the large intestine, the end of t
Archive image from page 1247 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( The interior of the caecum corresponds in general appearance to that of the large intestine; but it presents two special features on the posterior part of its medial wall, namely, the ileo-csecal orifice, guarded by the valvula coli ( ileo- cecal valve), and below this the small opening of the processus vermiformis, both of which call for further notice. Valvula Ooli ( Ileo-csecal Valve).—Where the ileum enters the large intestine, the end of the small gut is, as it were, thrust through the wall of the large bowel, carrying with it certain layers of that wall, which project into the caecum in the form of two folds, lying respectively above and below its orifice, and constituting the two seg- ments of the valve (Fig. 952). The condition may be compared to a partial inversion or telescoping of the small into the large intestine: it must be ig added that the peritoneum and longi- tudinal muscular fibres of the bowel take no part in this infolding; on the contrary, they are stretched tightly across the crease produced on the ex- terior by the inversion, and thus serve to preserve the fold and the formation of the valve. As seen from the interior, in speci- mens which have been distended and dried (Fig. 953), the valve is made up of two crescentic segments—a superior, labium superius, in a more or less horizontal plane, forming the superior margin of the aperture; and an inferior, labium inferius, which is larger, placed in an oblique plane, and sloping upwards and inwards ( towards the cavity of the csecuni). Between the two seg- ments is situated the slit-shaped open- ing, which runs in an almost antero- posterior direction, with a rounded an- terior and a pointed posterior extremity (Fig. 952). At each end of the orifice the two segments of the valve meet, unite, and are then prolonged around the wall of the ca
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