Self-component. Pictograph of a cut slab of meat with internal striations marking muscle and sinew — outer frame is the cut shape, inner strokes the marbling. Already this stylized in oracle bones. As Kangxi radical #130 it appears in compounds as the look-alike side-form ⺼ ('meat moon'):
肝 liver,
脏 organ,
胃 stomach,
脸 face,
肌 muscle.