A blade for an aircraft turbomachine turbine, comprising a blade root defining a radially internal end of the blade and an airfoil part radially extending toward the outside from the blade root and having a pressure-side wall and a suction-side wall connected to the pressure-side wall at a leading edge and at a trailing edge of the airfoil part, the airfoil part comprising at least one internal cooling circuit (50; 50'; 50a), wherein said internal cooling circuit includes a plurality of cavities interconnected in series and distributed into: - at least one cavity (54; 54, 54'; 54, 116) radially extending along the suction-side wall, hereinafter referred to as a suction-side cavity, and - cavities (52, 56; 52', 56'; 52, 114, 56) radially extending along the pressure-side wall, hereinafter referred to as pressure-side cavities, in an equal number to the number of suction-side cavity or cavities increased by one, and wherein: - the or each suction-side cavity (54; 54, 54'; 54, 116) is separated from at least one of the pressure-side cavities (52, 56; 52', 56'; 52, 114, 56) by a first internal wall of the airfoil part extending between the pressure-side and the suction-side walls, - each pressure-side cavity (52, 56; 52, 56, 52', 56'; 52, 114, 56) has an air inlet section (60, 62) and an air outlet section (64, 66), said air outlet section of the pressure-side cavity being radially arranged toward the outside with respect to said air inlet section of this same pressure-side cavity, - the or each suction-side cavity (54; 54, 54'; 54, 116) includes an air inlet section connected to the air outlet section of one (52; 52, 52'; 52, 114) of the pressure-side cavities and an air outlet section connected to the air inlet section of another (56; 56, 56'; 114, 56) of the pressure-side cavities, said air outlet section of the suction-side cavity being radially arranged toward the inside with respect to said air inlet section of this same suction-side cavity, - said air inlet section of one of the pressure-side cavities (52; 52, 52'; 52) is connected to cooling air supply means, - said at least one suction-side cavity (54; 54, 54'; 54, 116) is arranged facing two of said pressure-side cavities (52, 56; 52, 56, 52', 56'; 52, 114, 56), from which it is separated by said first internal wall of the airfoil part, and - said at least one suction-side cavity includes at least one first deflector extending protruding from the suction-side wall in the direction of the first internal wall of the airfoil part, characterised in that said first deflector has a concavity radially oriented toward the outside towards a side wall (78; 113, 78; 120, 78) of the at least one suction-side cavity disposed on a same side as the pressure-side cavity to which the air outlet section of said at least one suction-side cavity is connected. - at least one cavity (54; 54, 54'; 54, 116) radially extending along the suction-side wall, hereinafter referred to as a suction-side cavity, and - cavities (52, 56; 52', 56'; 52, 114, 56) radially extending along the pressure-side wall, hereinafter referred to as pressure-side cavities, in an equal number to the number of suction-side cavity or cavities increased by one, - the or each suction-side cavity (54; 54, 54'; 54, 116) is separated from at least one of the pressure-side cavities (52, 56; 52', 56'; 52, 114, 56) by a first internal wall of the airfoil part extending between the pressure-side and the suction-side walls, - each pressure-side cavity (52, 56; 52, 56, 52', 56'; 52, 114, 56) has an air inlet section (60, 62) and an air outlet section (64, 66), said air outlet section of the pressure-side cavity being radially arranged toward the outside with respect to said air inlet section of this same pressure-side cavity, - the or each suction-side cavity (54; 54, 54'; 54, 116) includes an air inlet section connected to the air outlet section of one (52; 52, 52'; 52, 114) of the pressure-side cavities and an air outlet section connected to the air inlet section of another (56; 56, 56'; 114, 56) of the pressure-side cavities, said air outlet section of the suction-side cavity being radially arranged toward the inside with respect to said air inlet section of this same suction-side cavity, - said air inlet section of one of the pressure-side cavities (52; 52, 52'; 52) is connected to cooling air supply means, - said at least one suction-side cavity (54; 54, 54'; 54, 116) is arranged facing two of said pressure-side cavities (52, 56; 52, 56, 52', 56'; 52, 114, 56), from which it is separated by said first internal wall of the airfoil part, and - said at least one suction-side cavity includes at least one first deflector extending protruding from the suction-side wall in the direction of the first internal wall of the airfoil part,