Abstract: Rehabilitation of an upper limb. The splint comprises: an arm (8) that is supported by a frame (10) consisting of at least one upper extension (20) that is provided at the end of a pivot (21) of a substantially vertical axis, an arch that is mounted on the pivot by means of a flexion-extensional drive motor (26) for the upper member, and an upper structure (31) that supports the anti-brachial and brachial segments and is comprised of a housing (34) that is adapted onto said arch, an abduction-adduction drive motor for the upper arm and an arm (40) that links said motor to the brachial segment. The invention can be used for passive motion splints.