has part has part has_part characteristic of has modifier abnormal synchondrosis abnormal cranial synchondrosis 2017-11-28T11:36:49Z MPheno.ontology MP:0030443 any anomaly in the development of cartilaginous joints or growth centers between bones of the skull base by the formation of hyaline cartilage which is abundant during the growth phase and ultimately ossifies during skeletal maturation; synchondroses are composed of mirror-image growth plates with a central resting zone, proliferative zones, and hypertrophic zones on both sides; in mouse, there are two synchondroses in the midline cranial base, the sphenooccipital and presphenoidal synchondroses abnormal cranial synchondroses abnormal cranial cartilage development quality abnormal cranial synchondrosis