has part has part has_part characteristic of abnormal temporal bone squamous part morphology abnormal temporomandibular joint morphology abnormal mandibular fossa morphology 2017-10-23T11:42:32Z any structural anomaly of the depression in the temporal bone that articulates with the mandible; it is a part of the temporomandibular joint and lodges the condyle of the mandible; in the temporal bone, the mandibular fossa is bounded anteriorly by the articular tubercle and posteriorly by the tympanic portion of the temporal bone, which separates it from the external acoustic meatus; the fossa is divided into two parts by a narrow slit, the petrotympanic fissure MP:0030311 MPheno.ontology squamous part of temporal bone