Types of small intestinal movement 1. Tonic contraction: the base of the other contractio 2. Segmentation contractions (1) def. When a portion of the small intestine becomes distended with chyme the stretch of the intestinal wall elicits a rhythmical contraction and relaxation of localized circular muscles spaced at intervals along the intestine, (2) function mix the chyme with the digestive juice increase its exposure to the mucosal surface9 1. Tonic contraction: the base of the other contractions 2. Segmentation contractions (1) def. When a portion of the small intestine becomes distended with chyme, the stretch of the intestinal wall elicits a rhythmical contraction and relaxation of localized circular muscles spaced at intervals along the intestine, (2) function: mix the chyme with the digestive juice increase its exposure to the mucosal surface Types of small intestinal movement