<prompt> Commonly injured in blunt abdominal injury isare -Mid ileumProx. jejunumMid jejunumDistal ileum  <response>: Answer is b i.e. Prox.Jejunum Small bowel is frequently injured after a penetrating injury After blunt trauma small bowel injury can be seen in 5-20 of patients who required laprotomy. Mechanism of injury of small bowel by blunt trauma Small bowel is injured by 3 postulated mechanisms 1 crushing of the bowel between the veebral bodies and the blunt object, such as steering wheel or handle bar. 2 deceleration shearing of the small bowel at points where it is fixed such as ligament of Treitz duodenojejunal jn, the ileocecal junction and around the mesentric aery. 3 closed loop rupture caused by sudden increase in intra-abdominal pressure. 