Infection of thenar space is drained by incision at?
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.
1st Webspace
2nd Webspace
Just above flexor retinaculum
3rd Webspace