peritoneum: a transparent membrane that lines the abdominal cavity in mammals and covers most of the viscera
serous membrane: a thin membrane lining the closed cavities of the body; has two layers with a space between that is filled with serous fluid
hydralazine: an antihypertensive drug (trade name Apresoline) that dilates blood vessels; used (often with a diuretic) to treat hypertension and congestive heart failure