Fig. 527.—Human adult. Ileo-colic junction and cæcum; ventral view. (Columbia University, Study Collection.)

Fig. 528.—Human adult. Ileo-colic junction and cæcum; ventral view. (Columbia University, Study Collection.)

Figs. 529-531 afford examples of this type, while [Fig. 532], taken from an infantile preparation, shows that the same may begin to develop at a very early age.

Fig. 529.—Human juvenile. Ileo-colic junction and cæcum; dorsal view. (Columbia University, Study Collection.)   Fig. 530.—Human adult. Ileo-colic junction and cæcum; dorsal view. (Columbia University Museum, No. 115.)
Fig. 531.—Human adult. Ileo-colic junction and cæcum; dorsal view. (Columbia University, Study Collection.)   Fig. 532.—Human infant, Ileo-colic junction and cæcum, with secondary terminal sacculation. Human infant, Ileo-colic junction and cæcum, with secondary terminal sacculation. (Columbia University Museum, No. 1632.)

3. Finally, in about four per cent. to five per cent., adult cæca, the reduction of the wall to the left of the root of the appendix, between this point and the ileo-colic junction, is complete. The entire cæcal pouch is formed by the dilated right wall between the ventral and dorsolateral muscular bands. The ventral band terminates at the lower border of the ileo-colic junction, from which the appendix appears to arise, indicating the original apex of the fœtal cæcum (schema, [Fig. 509], IIe).

This type is illustrated in the specimens shown in Figs. 533 and 534.