has part has part has_part characteristic of part of has modifier abnormal sphenoid bone morphology abnormal pterygoid process morphology MP:0004452 any structural anomaly of the process projecting downward from either side of the sphenoid bone, in vertebrates divided into two plates, an inner and an outer (sometimes called the lateral and medial); the posterior nares pass through the space, called the pterygoid fossa, between the processes MPheno.ontology morphology abnormal sphenoid bone pterygoid process