has part has part has_part characteristic of part of has modifier abnormal subarcuate fossa morphology MPheno.ontology abnormal floccular fossa MP:0009822 any structural anomaly of the irregular depression found on the posterior inner surface of the petrous portion of the temporal bone just below its crest and above and lateral to the internal acoustic meatus abnormal cranial fossa morphology abnormal temporal bone petrous part morphology morphology abnormal subarcuate fossa