The intestines begin as a straight tube, suspended by the dorsal mesentry. The midgut and mesentry elongate to form a loop. The descending limb of the loop will form the [[Duodenum - Anatomy & Physiology|duodenum]], [[Jejunum - Anatomy & Physiology|jejunum]] and [[Ileum - Anatomy & Physiology|ileum]]. The ascending limb will form the terminal portion of the [[Ileum - Anatomy & Physiology|ileum]], [[Caecum - Anatomy & Physiology|caecum]] and first half of the [[Colon - Anatomy & Physiology|colon]]. The midgut loop rotates about the cranial mesenteric artery in a clockwise direction (when viewed dorsoventrally). It undergoes a 270° rotation so that the [[Caecum - Anatomy & Physiology|caecum]] and ascending [[Colon - Anatomy & Physiology|colon]] ends up on the right, and the small intestine ends up on the left. | The intestines begin as a straight tube, suspended by the dorsal mesentry. The midgut and mesentry elongate to form a loop. The descending limb of the loop will form the [[Duodenum - Anatomy & Physiology|duodenum]], [[Jejunum - Anatomy & Physiology|jejunum]] and [[Ileum - Anatomy & Physiology|ileum]]. The ascending limb will form the terminal portion of the [[Ileum - Anatomy & Physiology|ileum]], [[Caecum - Anatomy & Physiology|caecum]] and first half of the [[Colon - Anatomy & Physiology|colon]]. The midgut loop rotates about the cranial mesenteric artery in a clockwise direction (when viewed dorsoventrally). It undergoes a 270° rotation so that the [[Caecum - Anatomy & Physiology|caecum]] and ascending [[Colon - Anatomy & Physiology|colon]] ends up on the right, and the small intestine ends up on the left. |