abdomen action anus appendix blind gut bowels brain cecum census clockworks colon composition constituents content contents divisions drive train duodenum elements endocardium entrails foregut gear giblets gizzard guts heart hindgut index ingredients inner mechanism insides internals intestine inventory inwards items jejunum kidney kishkes large intestine list liver liver and lights lung machinery mechanism midgut motion movement movements part parts perineum power train pump pylorus rectum servomechanism small intestine spleen stomach stuffing ticker tripes vermiform appendix viscera vitals watchworks wheels wheels within wheels whole workings works