has part has part has_part characteristic of part of has modifier abnormal humerus morphology abnormal olecranon fossa morphology 2018-10-10T10:14:55Z MP:0030855 MPheno.ontology abnormal fossa olecrani morphology any structural anomaly of the deep triangular depression on the posterior side of the humerus, superior to the trochlea, in which the summit of the olecranon is received during extension of the forearm morphology abnormal olecranon fossa