J.Jpn. Surg. Soc.. 57(9): 1593-1602, 1956
EXPERIMENTAL STUDY ON THE MECHANISM OF PRODUCTION OF ILEOCECAL-INTUSSUSCEPTION
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Surgical Department, Keio Gijuku University School of Medicine (Director: Prof. Nobukatsu SHIMADA) Saburo OKADA |
The conditions necessary are that, firstly, the mesentery in the ileocecal area should be long and freely movable, and secondly, there should be produced a marked difference in the internal diameters of the cecum and terminal ileum on the one hand being contracted and the proximal portion of the ascending colon being uncontracted on the other. In this way a state closed to umbrella-like encapsulation, which is considered to be an initiation for intussusception, is brought about. However, in order that the said condition can reach the completed state of umbrella-like encapsulation, it is thought that there should be, in addition, a certain external force, an anatomic abnormality of the ileocecal area, or motor dysfunction of the ileocecal region.
It is shown experimentally that the originating point of the ileocecal intussusception is the ileocecal valve pushed forward by the contracted cecum or contracted terminal ileum. The intussusception develops a progress, because a tonic ring of contraction appears in the proximal portion of the ascending colon closed to the ileocecal valve, and extends toward the anal side; the cecum or the ileocecal valve held by the ring is withdraws toward the anal side and like the intestinal contents and the intussusception is completed.
In other wards, the physiologic function of the colon to transport its contents acts as the propelling action for intussusception.
It is further observed that the tip of the intussusception does not move.
The process of this experimental intussusception well agree with clinical findings.
(author's abstract)
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