1.Previous
3.Next

They can either be "complete", joining the gastrodermis of the body wall with that of the pharynx, or "incomplete", extending only part way into the cavity (the terms "perfect" and "imperfect" are sometimes used instead). They stretch from the pedal disc to the oral disc, and there are two perforations or ostia near the oral disc. Mesenteries are usually in pairs. The free edge of incomplete mesenteries are thickened to form glandular, ciliated bands called mesenterial filaments. The lower ends of the mesenterial

1.Previous
3.Next