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- B8de78e0e1e209543536191672195b53f source "http://palaeos.com/vertebrates/glossary/glossaryPte.html" @default.
- B8de78e0e1e209543536191672195b53f type Axiom @default.
- B8de78e0e1e209543536191672195b53f annotatedProperty UBPROP_0000001 @default.
- B8de78e0e1e209543536191672195b53f annotatedSource UBERON_0010389 @default.
- B8de78e0e1e209543536191672195b53f annotatedTarget "In tetrapods, the pterygoid is a complex, but relatively stable, paired palatal bone with a number of parts. For the following discussion, it may be best to refer to the images of tetrapod palates at, for example Ornithosuchus, Therapsida, or Palatines. In many tetrapods, it is the largest palatal bone and serves as the main structural support. Most typically, the pterygoids meet extensively on the mid-line of the palate and jointly send a process, the palatal ramus, anteriorly, which may cover the parasphenoid more or less completely. Sometimes this term is used to include the main body of the pterygoid as well. More variably, there are one or two anterolateral processes which go by various names, such as ectopterygoid ramus. In many amniotes, the pterygoid develops a strong transverse process or transverse flange which forms a bar running laterally across the palate. The pterygoid also articulates with (where present) the dorsoventral supports for the palate: the epipterygoid (dorsal) and the basipterygoid process of the braincase. Finally, the pterygoid sends a long, robust quadrate ramus with complex curvature down (posteroventrally) to grasp the quadrate and support the jaw articulation. Basally, in fishes, the terminology tends to be a little different. Refer to the image of the Frasnian actinistian Diplocercides. The pterygoid bone of tetrapods is, roughly speaking, derived from the middle, entopterygoid (see also entry at entopterygoid for alternative definitions) portion of the palatoquadrate complex. The entopterygoid is not actually a part of the palatoquadrate. It is a dermal bone which has replaced the middle section of the primitively continuous endochondral bone of the palatoquadrate, the original upper jaw. In tetrapods, the pterygoid advances further, and also replaces the central part of the posterior, pterygoquadrate unit. This becomes the quadrate ramus. The upper part of this unit, the portion involved in the dorsal and basipterygoid articulations between jaw and braincase, is referred to as the metapterygoid. In tetrapods, most of this region is incorporated into the pterygoid as well, with the exception of the ascending process of the palatoquadrate, which becomes the epipterygoid. Since the anterior braincase articulation is lost in tetrapods, the only remaining sections of the palatoquadrate are the epipterygoid and the quadrate (or, in mammals, the incus). Everything else is either lost or is replaced by the pterygoid[Palaeos]" @default.