. Human embryology and morphology. Embryology, Human; Morphology. THE ORGANS OF DIGESTION. 279 permanent position in front of the right kidney and inferior vena cava. The caecum thus comes to be situated in front of the right kidney, near the gall-bladder, and there it remains until about the time of birth, when both the caecum and ascending colon undergo a gradual migration towards the right iliac fossa. The cause of this migration is not known, but it occurs only in animals adapted to the upright posture. Thus the attachment of the ascending meso-colon is formed by a secondary adhesion to th
. Human embryology and morphology. Embryology, Human; Morphology. THE ORGANS OF DIGESTION. 279 permanent position in front of the right kidney and inferior vena cava. The caecum thus comes to be situated in front of the right kidney, near the gall-bladder, and there it remains until about the time of birth, when both the caecum and ascending colon undergo a gradual migration towards the right iliac fossa. The cause of this migration is not known, but it occurs only in animals adapted to the upright posture. Thus the attachment of the ascending meso-colon is formed by a secondary adhesion to the parietal peritoneum during the migra- tion of the colon and caecum. The appendix, during . the migration, may be caught behind the colon; it is then lodged and fixed in the ascending meso-colon. great oment. duodeno-jej. fossa sup. mes. art. â left colic artery. pre-art. part mes.' ^^(^m^L '"/â mesent mter-sig. fossa sigmoid artery Fio. 226.âTo show the Kotation of the Intestinal Loop and Formation of the Duodenojejunal Fossa. The Appendix.âAt first and until the third month, the caecal diverticulum is of the same calibre throughout, but from the third month onwards, the appendix remains small while the caecum grows, keeping pace in diameter with the colon. At birth the appendix is still the tapered apex of the caecal diverti- culum (Fig. 224), but during childhood, an outer, or an inner, sacculation, or both together, arise in the fundus of the caecum and thrust the appendix backwards and to the left into an asymmetrical position. Although a distinctly marked appendix is only seen in man, the anthropoids, lemur, and opossum, still a corresponding. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Keith, Arthur, Sir, 1866-1955. London : E. Arnold
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