Right pterygoid, palatine, and vomer of Acrocanthosaurus atokensis (NCSM 14345) in medial view.

Left vomer is figured until it reaches anterior extent of the right palatine. b, break; er, ectopterygoid ramus of the pterygoid; erf, fossa of the ectopterygoid ramus of the pterygoid; PA, palatine; pm, premaxillary contact; PT, pterygoid; ptm, pterygoid medial process; ptf, pterygopalatine fenestra; ppp; pterygoid process of palatine; qr, quadrate ramus of pterygoid; qrf; fossa of the quadrate ramus of the pterygoid; V, vomer; vpar, vomeropalatine ramus of the pterygoid.