A surgical instrument (12; 712; 812) and first, second and third parts (28, 68, 98), the surgical instrument (12; 712; 812) comprising: an element (14; 714; 814) connectable with a fixture (11; 711); a first member (20; 820) independently and selectively movable relative to the element (14; 714; 814) and including an extension, wherein the first member (20, 820) is connected to the first part engageable with tissue of a substantially posterior portion of an incision relative to a body; a second member (60; 860) independently and selectively movable relative to the element (14; 714; 814) and including an extension, wherein the second member (60, 860) is connected to the second part engageable with tissue of a substantially anterior portion of the incision relative to the body; a third member (90; 890) independently and selectively movable relative to the element (14; 714; 814) and including an extension, wherein the third member (90, 890) is connected to the third part engageable with tissue of a substantially cephalad portion of the incision relative to the body, and at least one adaptor (130, 330, 530); wherein at least one of the members (20, 60, 90; 820, 860, 890) is connected to the corresponding part (28, 68, 98) by the adaptor (130; 330; 530) disposed between the member (20, 60, 90; 820, 860, 890) and the part (28, 68, 98), the adaptor (130; 330; 530) including a moveable ramp interface such that the part (28, 68, 98) is releasably engageable with the member (20, 60, 90; 820, 860, 890), wherein the adaptor (130, 330, 530) includes a housing (132, 332, 532) configured for a mating engagement with the extension (24, 64, 94) and including a surface (134, 334, 534) that defines a first cavity (136, 336, 536) and a second cavity (138, 338, 538) configured for disposal of an actuator (140, 340, 540), wherein the surface (134, 334, 534) further defines a third cavity (150, 350, 550) in communication with the first cavity (136, 336, 536) and disposed transverse relative to the first and second cavities (136, 138, 336, 338, 536, 538), wherein the part (28, 68, 98) includes an arm configured for disposal in the third cavity (150, 350, 550), wherein the arm further comprises an anti-rotational element for disposal in a fourth cavity of the housing of the adaptor, wherein the fourth cavity is disposed transverse relative to the first and second cavities (136, 138); or the arm includes a tapered configuration and is configured for disposal within the third cavity which includes a tapered surface configured to form a friction fit with a surface of arm, or the arm is configured for disposal within the third cavity having an oval cross section configuration such that the surface engages a surface of the arm in an interference fit. an element (14; 714; 814) connectable with a fixture (11; 711); a first member (20; 820) independently and selectively movable relative to the element (14; 714; 814) and including an extension, wherein the first member (20, 820) is connected to the first part engageable with tissue of a substantially posterior portion of an incision relative to a body; a second member (60; 860) independently and selectively movable relative to the element (14; 714; 814) and including an extension, wherein the second member (60, 860) is connected to the second part engageable with tissue of a substantially anterior portion of the incision relative to the body; a third member (90; 890) independently and selectively movable relative to the element (14; 714; 814) and including an extension, wherein the third member (90, 890) is connected to the third part engageable with tissue of a substantially cephalad portion of the incision relative to the body, and at least one adaptor (130, 330, 530); wherein at least one of the members (20, 60, 90; 820, 860, 890) is connected to the corresponding part (28, 68, 98) by the adaptor (130; 330; 530) disposed between the member (20, 60, 90; 820, 860, 890) and the part (28, 68, 98), the adaptor (130; 330; 530) including a moveable ramp interface such that the part (28, 68, 98) is releasably engageable with the member (20, 60, 90; 820, 860, 890), wherein the adaptor (130, 330, 530) includes a housing (132, 332, 532) configured for a mating engagement with the extension (24, 64, 94) and including a surface (134, 334, 534) that defines a first cavity (136, 336, 536) and a second cavity (138, 338, 538) configured for disposal of an actuator (140, 340, 540), wherein the surface (134, 334, 534) further defines a third cavity (150, 350, 550) in communication with the first cavity (136, 336, 536) and disposed transverse relative to the first and second cavities (136, 138, 336, 338, 536, 538), wherein the part (28, 68, 98) includes an arm configured for disposal in the third cavity (150, 350, 550), wherein the arm further comprises an anti-rotational element for disposal in a fourth cavity of the housing of the adaptor, wherein the fourth cavity is disposed transverse relative to the first and second cavities (136, 138); or the arm includes a tapered configuration and is configured for disposal within the third cavity which includes a tapered surface configured to form a friction fit with a surface of arm, or the arm is configured for disposal within the third cavity having an oval cross section configuration such that the surface engages a surface of the arm in an interference fit.