A turbine blade (2) having an open cavity (5) at its distal end (3), said cavity (5) being delimited by a bottom wall (7) and a side wall (9, 10) extending along the perimeter of said distal end (3) in the extension of the intrados (8) and extrados (11) of the vane (2), the side wall (9, 10) of the cavity (5) having an opening (20); ) in the vicinity of the leading edge (12) of the blade (2) opening into the cavity (5). A deflector (21) extends at least in the middle portion of the cavity (5) between the leading edge (12) and the trailing edge (14).
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