A surgical access assembly (100) for accessing a cavity of a patient includes a proximal frame member (120), a distal frame member (160), and a membrane (180) between the proximal and distal frame members. The proximal frame member is positionable adjacent an external surface of tissue and has first and second frame portions (123,143) movable between a contracted condition and an expanded condition to expand an opening defined therethrough. The membrane defines a loop (382) disposed about at least a portion of the proximal frame member at a proximal end thereof and is engaged to the distal frame member at a distal end thereof. The membrane is transitionable between a crumpled condition and an extended condition upon transitioning of the proximal frame member between the contracted condition and the expanded condition.
