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The first lower premolar was canine-like. Compared to some of its later relatives, Interatherium and Protypotherium, Argyrohyrax had a moderately expanded zygomatic arch; its radius had a slightly concave distal articular surface, and the articulation between its ulna and its humerus was less concave and more vertical.
The postorbital bar (or postorbital bone) is a bony arched structure that connects the frontal bone of the skull to the zygomatic arch, which runs laterally around the eye socket. It is a trait that only occurs in mammalian taxa, such as most strepsirrhine primates [1] and the hyrax, [2] while haplorhine primates have evolved fully enclosed ...
The deep head is much smaller, and more muscular in texture. It arises from the posterior third of the lower border and from the whole of the medial surface of the zygomatic arch. Its fibers pass downward and forward, to be inserted into the upper half of the ramus as high as the coronoid process of the mandible. The deep head of the muscle is ...
The zygomasseteric system (or zygomasseteric structure) in rodents is the anatomical arrangement of the masseter muscle of the jaw and the zygomatic arch of the skull. The anteroposterior or propalinal (front-to-back) motion of the rodent jaw is enabled by an extension of the zygomatic arch and the division of the masseter into a superficial, lateral and medial muscle.
In anatomy, the zygomatic arch, or cheek bone, is a part of the skull formed by the zygomatic process of the temporal bone (a bone extending forward from the side of the skull, over the opening of the ear) and the temporal process of the zygomatic bone (the side of the cheekbone), the two being united by an oblique suture (the zygomaticotemporal suture); [1] the tendon of the temporal muscle ...
It had large canine teeth, and heavy molars, suggesting a diet of relatively tough food, such as seeds and savannah grasses. [ 7 ] Similarities to orangutans in what are chiefly jaw and partial skull fossils are a concave face with large zygomatic arch bones, narrow setting of eyes from each other, smoothness of nasal floor, and central incisor ...
The masseter, which extends from the zygomatic arch to the lower rear corner of the mandible, is a major component of the chewing apparatus in herbivorous artiodactyls. While other artiodactyls added torque to the muscle by raising the jaw joint, entelodonts instead expanded the rear of the jaw downwards, as a deep, curved flange.
The curved portion of the process is referred to as the alveolar arch. [5] The alveolar bone proper , also called bundle bone , directly surrounds the teeth. [ 6 ] The terms alveolar border , alveolar crest , and alveolar margin describe the extreme rim of the bone nearest to the crowns of the teeth.
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