A microlead, of an overall diameter less than 0.5 mm, includes a plurality of at least eight conductor wires individually insulated and twisted together. Each conductor wire includes an electrically conductive core microcable and an insulation layer surrounding the core microcable and having at least one exposed area to form a detection/stimulation electrode of the microlead. The microlead further includes a central support structure shaped as a surface of revolution, which may be free of conductor wires and of central lumen. The conductor wires are configured in one or more layers of twisted peripheral conductor wires carried by the central support structure and circumferentially distributed thereon.
