Écorché

An écorché (French pronunciation: ​[ekɔʁʃe]) is a figure drawn, painted, or sculpted showing the muscles of the body without skin, normally as a figure study for a work, or as an exercise in training. Renaissance architect and theorist, Leon Battista Alberti recommended that when painters intend to depict a nude, they should first arrange the muscles and bones, then depict the overlying skin.