ANTITHENAR, in Anatomy, a Muscle of the Thumb whose Office is to draw it to the Fingers. It arises from the Bone of the Metacarpus that sustains the Fore-finger, and is inserted into the first Bone of the Thumb. See FINGER. ANTITHENAR is also the Name of a Muscle of the great Toe; which arising from the inferior part of the third Os Cuneiforme, and passing obliquely, is inserted into the inside of the Os Sesamoidea. See TOE. The Word is compounded of the Greek ἀντί, against; and θέναρ, as being Antagonist to the Thenar. See THENAR.
