has part has part has_part characteristic of has modifier abnormal semicircular canal ampulla morphology absent semicircular canal ampulla MP:0009262 MPheno.ontology absent abnormal membranous ampullae of the semicircular ducts absence of the spherical enlargement at the base of each semicircular canal where they connect with the utricle, containing the crista ampullaris which detects movement of the fluid within the canals abnormal absent semicircular canal ampulla