page_title: Suture (anatomy)
section_title: Sutures in the ankles of land vertebrates
hierarchical_section_title: Suture (anatomy) / Vertebrate skeletons / Sutures in the ankles of land vertebrates
caption_attribution_description: English: "Crocodile normal" crurotarsal ankle
context_page_description: In anatomy, a suture is a fairly rigid joint between two or more hard elements of an organism, with or without significant overlap of the elements.
  Sutures are found in the skeletons or exoskeletons of a wide range of animals, in both invertebrates and vertebrates. Sutures are found in animals with hard parts from the Cambrian period to the present day. Sutures were and are formed by several different methods, and they exist between hard parts that are made from several different materials.
context_section_description: In the type of crurotarsal ankle which is found in crocodilians and some other archosaurs, the astragalus is fixed to the tibia  by a suture, and the joint bends around a peg on the astragalus, which fits into a socket in the calcaneum.
caption: Crocodilian form of crurotarsal ankle. The astragalus (pink) is fixed to the tibia (green) by a suture. Adapted with permission from Palaeos
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