<prompt> Infection of thenar space is drained by incision at?1st Webspace2nd WebspaceJust above flexor retinaculum3rd Webspace  <response>: Thenar space communicates with fascial sheath of 1st Lumbrical. Mid palmar space communicates with fascial sheath of 2nd, 3rd 4th Lumbrical. 2nd space cannot be incised in palmar space infection due to risk of damaging intermediate septum. Infections of thenar space is drained by incising 1st webspace. 