Skip to Content
Medical Term:


Pronunciation: stum'ak


A large, irregularly piriform sac between the esophagus and the small intestine, lying just inferior to the diaphragm; when distended it is 25–28 cm long and 10–10.5 cm in its greatest diameter, and has a capacity of about 1 L. Its wall has four coats or tunics: mucous, submucous, muscular, and peritoneal; the muscular coat is composed of three layers, the fibers running longitudinally in the outer, circularly in the middle, and obliquely in the inner layer.

Synonym(s): gaster1TA, ventriculus1TA

[G. stomachos, L. stomachus]

© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.