A method for expanding the skin, fascia, muscle, and peritoneal layers of the abdominal wall is described, and clinical application is demonstrated in two children with cloacal exstrophy and congenital absence of the lower half of the abdominal wall. This technique provides an innervated composite reconstruction of defects in excess of 50 percent of the abdominal surface and is recommended in large secondary defects where peritonealization has been achieved and in congenital defects that do not lend themselves to standard methods of closure. Cadaver dissection confirms that tissue expanders may be placed with preservation of innervation and blood supply to the abdominal wall.