Page 105 - Clinical Anatomy

ECA2 7/18/06 6:42 PM Page 90

90 The abdomen and pelvis

The development of the intestine and its
congenital abnormalities (Fig. 69)
The primitive endodermal tube of the gut is divided into:
1◊◊the fore-gut (supplied by the coeliac axis) extending as far as the entry of
the bile duct into the duodenum;
2◊◊the mid-gut (supplied by the superior mesenteric artery) continuing as
far as the distal transverse colon;
3◊◊the hind-gut (supplied by the inferior mesenteric artery) extending
thence to the ectodermal part of the anal canal.

Fig. 69◊Stages in rotation of the bowel. (a) The prolapsed mid-gut loop, seen in
lateral view. (b) The mid-gut returns to the abdomen. (c) The caecum descends to its
definitive position. Note the completion of stomach-rotation with the formation of
the lesser sac (omental bursa).