Supra-angular

Su`pra-an´gu`lar


a.1.(Anat.) See Surangular.
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The right mandibular rami demonstrated some loss of bone density at the level of the palatine bone; the initial fracture was speculated to be on both the os prearticulare (prearticular bone) and the os supra-angulare (supra-angular bone).
(6) Each ramus of the mandible consists of the os supra-angulare (dorsal supra-angular bone), os angulare (ventral angular bone), os articulare (osterior articular bone), os spleniale (splenial bone), os prearticulare (prearticular bone), and os dentale (dentary bone) (Fig 9).
The two halves of the mandible are fused, indicating no limit between them, and comprise: (1) the coronoid, (2) the dentary, and (3) the supra-angular.
Coronoid (Co): a bone element situated dorsally between the dentary rostrally and the supra-angular caudally.
The caudolateral edge of the dentary is irregular and invests laterally in the direction of the ventral rims of the coronoid and the supra-angular. The labial edge extends along the entire lateral region of the dentary and is perforated by numerous small foramina.
The supra-angular forms the medial wall of the area articularis mandibularis.
The dentary, coronoid and supra-angular present ossification centers in stage 16, with greater dye retention in the dentary, indicating that this element is the first to present an ossification center (Figures 3A, B and 4A).
Rieppel (1993) identified the following sequence of ossification of these elements: dentary > coronoid = supra-angular. The ossification of these elements was followed by that of the quadrate in the subsequent stage.
spinifera (SHEIL, 2003), in which the chronology and sequence of ossification of the mandible differ: dentary > supra-angular > coronoid.