While performing culdocentesis in female patient ,needle should be most efficiently inseed through which of the following structures ?
A needle should be inseed through the posterior fornix, just below the posterior lip of cervix while the patient is in supine position, to aspirate abnormal fluid i the cul-de-sac of Douglas(rectouterine pouch). Rectouterine excavation is not most efficiently aspirated by puncture of other structures.