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Medical Definition of Pneumatoenteric
1. Medial and lateral recesses at either side of the urogenital mesentery of the embryo, superior recess of the vestibule of the lesser peritoneal space; with the formation of the diaphragm, a portion of the right recess is cut off and becomes the infracardiac bursa; the portion below the diaphragm becomes the superior recess of the lesser peritoneal sac; the left recess is lost. Synonym: pneumatoenteric. (05 Mar 2000)