abnormal stapes obturator foramen morphology small stapes obturator foramen 2017-11-15T14:47:37Z small obturator foramen of stapes MP:0030405 MPheno.ontology small stapedial foramen reduced stapes obturator foramen size small intercrural foramen of stapes reduced size of the central foramen (hole) located between the crura and the footplate of the stapes through which the stapedial artery passes decreased stapes obturator foramen size