. Cunningham's Text-book de l'anatomie. L'anatomie. 1216 LE SYSTÈME DIGESTIF. a été trouvé dans presque toutes les situations possibles dans l'abdomen qui sa longueur et l'étendue de son méso lui permettrait d'atteindre. Dans tous les cas, le taenia antérieur du caecum, qui est toujours distincte, propose le guide le plus sûr pour le processus vermiforme, et sa base peut être situé avec certitude en suivant ce taenia à l'arrière du caecum (Fig. 954). Sa taille est presque aussi variable que sa position. En prenant la moyenne de plusieurs mesures, sa longueur peut être donné comme sur 3J po (92 mm., Berry), et

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. Cunningham's Text-book of anatomy. Anatomy. 1216 THE DIGESTIVE SYSTEM. has been found in almost every possible situation in the abdomen which its length and the extent of its mesentery would allow it to attain. In every case the anterior taenia of the caecum, which is always distinct, offers the surest guide to the vermiform process, and its base can be located with certainty by following this taenia to the back of the caecum (Fig. 954). Its size is almost as variable as its position. Taking the average of numerous measurements, its length may be given as about 3J inches (92 mm., Berry), and its breadth as inch (6 mm., Berry). On the other hand, it has been found as long as 9 inches (230 mm.), and as short as f inch (18 mm.). Even its absence has been recorded (Fawcett), but this must be looked upon as an extremely rare occurrence. Its lumen or cavity is variable in its development, and is found to be totally or partially occluded in at least one-fourth of all adult and old bodies examined. This is looked upon as a sign of degeneracy in the process of gradual oblitera- tion, which it is by many considered to be undergoing, in the human species. It opens into the cavity of the caecum on its medial, or medial and posterior aspect. The Blood-Supply of the C^cuji axd Vermiform Process. The illustration to the left gives a front view ; in that to the right the caecum is viewed from behind. In the latter the artery of the process, and three taeniae coli springing from the base of the vermiform process should be specially noted. (Modified from Jonnesco). (Fig. 952), at a point 1 to 1J inches (2*5 to 3-8 cm.) below, and somewhat posterior to the ileo-csecal orifice. These are the relative positions of the two orifices, as seen from the interior of the caecum; viewed from the exterior, the base of the vermiform process is within f inch of the lower border of the ileum. This apparent difference is due to the fact that the ileum adheres to the medial side of the caecum for

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