Because the tube may injure or perforate the esophagus, gastric lavage is contraindicated. Rarely, an intrauterine device can perforate the uterine wall and enter the peritoneum. They instead respire through a series of gill slits that perforate the body wall. Branches from the myenteric plexus perforate the circular muscle fibers to form the submucosal plexus. Perforating ulceration which may perforate, resulting in corneal opacification and staphyloma formation. It is also where the inferior epigastric vessels perforate the rectus abdominis. Limber holes perforate the wall of the box at the floor of each chamber. The test (or shell) wall is calcareous, perforate, with cylindrical pores. It is caused by a failure of the hymen to perforate during fetal development. Its powerful warhead is able to perforate a thick steel armoured hull. It derives from the Latin forare meaning to bore or perforate. Many caves perforate the limestone bedrock underneath the surface, as is common in karst areas. It does not perforate hair or hair follicles. The larvae feed on living tissue and in worst cases can perforate the bill. Eastman Kodak used the Bell and Howell's machine to perforate its films.