Wnt8c in the hindlimb and Wnt2b in the forelimb. "Apatosaurus" had a single claw on each forelimb and three on each hindlimb. Thus, in the pterosaurs, the "wing" involves both the forelimb and the hindlimb. The fusion of the radius and ulna prevents an ungulate from rotating its forelimb. Knowledge of equine forelimb anatomy is especially useful for understanding navicular syndrome. Hoxd13 gene plays a role in axial skeleton development and forelimb morphogenesis. The scapula serves as the attachment site for a dinosaur's back and forelimb muscles. The scapula served as the attachment site for a dinosaur's back and forelimb muscles. "Deinonychus" possessed large "hands" (manus) with three claws on each forelimb. For example, Klumpke paralysis can occur from excessive pulling of the infant's forelimb during parturition. The forelimb thus develops into a flipper. The shoulder girdle was longer than the entire forelimb. Various uses have been proposed for the single claw on the forelimb of sauropods. Various uses for the single claw on the forelimb of sauropods have been proposed. Megabats have a claw on the second finger of the forelimb.