Rotation of intestinal tube (RIТ) passes against hand in 4 stages of human embryogenesis. RIT in white rat was not described in literature. On first stage of RIT (on 90°) midgut is displaced on the right side from hindgut (colon) under pressure of hepatic right lobe. Growth of ventral (preportal) parts of liver predominates on second stage of RIT in man, including passing to the right side and under duodenum. Therefore head of pancreas (HP) grows to the left side with displacing of initial segment of jejunum under sagittal segment of colon and to the left side from midline, where loops of jejunum are formed. II RIT is absent in white rat: growth of dorsal (retroportal) parts of liver predominates, they displace inner organs to bottom of abdominal cavity. Therefore all small intestine remains on the right side from midline, hindgut is on the left side from midline and on the it at more caudal level. HP grows into mesocolon. Caecum with its oblique and sagittal position is on the left edge of caudal part of umbilical hernial sac, loops of ileum occupies the remaining, most part of the sac. III RIT in man manifests as transference of sagittal segment of colon together with caecum and loops of ileum to the right side from midline (transition from sagittal plane in frontal plane). III RIT inverts and reduces in rat:
-
after setting in abdominal cavity loops of ileum are directed by means of hepatic right lobe often to the left side from midline and they displace initial part of colon to the right side with formation its ventral loop;
-
jejunum forms loops on the right side from midline and they «leave» middle part of ascending colon on midline;
-
HP «stretches» colon to the right side with formation dorsal loop of colon, which includes transverse colon and ending of ascending colon (reduced transition from sagittal plane in frontal plane);
-
caecum makes similar turn to the right side (on ≥ 90°) by means of traction of ileum and remains under liver (IV RIТ is absent in rat) or passes to the left side from midline and grows in caudal direct, to the left iliac fossa (inverse and reduced IV RIT).
The work was submitted to international scientific conference «Fundamental and applied research in medicine», France (Paris), 15-22 October 2011, came to the editorial office on 23.11.2011.