the connection between a tooth and jaw bone is an example of periodontal ligament.
the connection between a tooth and jaw bone is an example of periodontal ligament.
the connection between a tooth and jaw bone is an example of what kind of connection?
periodontal ligament
Na
Na
the skull of "acrocanthosaurus", like most other allosauroids, was long, low and narrow. the weight-reducing opening in front of the eye socket (antorbital fenestra) was quite large, more than a quarter of the length of the skull and two-thirds of its height. the outside surface of the maxilla (upper jaw bone) and the upper surface of the nasal bone on the roof of the snout were not nearly as rough-textured as those of "giganotosaurus" or "carcharodontosaurus". long, low ridges arose from the nasal bones, running along each side of the snout from the nostril back to the eye, where they continued onto the lacrimal bones. this is a characteristic feature of all allosauroids. unlike "allosaurus", there was no prominent crest on the lacrimal bone in front of the eye. the lacrimal and postorbital bones met to form a thick brow over the eye, as seen in carcharodontosaurids and the unrelated abelisaurids. nineteen curved, serrated teeth lined each side of the upper jaw, but a tooth count for the lower jaw has not been published. "acrocanthosaurus" teeth were wider than those of "carcharodontosaurus" and did not have the wrinkled texture that characterized the carcharodontosaurids. the dentary (tooth-bearing lower jaw bone) was squared off at the front edge, as in "giganotosaurus", and shallow, while the rest of the jaw behind it became very deep. "acrocanthosaurus" and "giganotosaurus" shared a thick horizontal ridge on the outside surface of the surangular bone of the lower jaw, underneath the articulation with the skull.
acrocanthosaurus