A surgical access device facilitates access to a surgical site within a patients body through an incision in the body. Surgical access devices can have a first retention member and a second retention member with a pliable membrane that extends between the first retention member and the second retention member. A retention member can include at least three linkages pivotably coupled to one another such that expanding the retention member causes at least some of the linkages to pivot relative to one another. The pliable membrane can be configured to expand the incision to facilitate access to the surgical site.
