part of ends during starts during middle ear auditory ossicle death cartilage element stapes 2012-03-10T10:07:32Z Bone of the ear that is connected to the tympanic membrane via the extrastapes. This structure is the amphibian ear ossicle, also known as the columella. It extends between extrastapes cartilage and the oval window. The extrastapes forms a cartilaginous tympanic disk. xenopus_anatomy columella XAO:0004310 eriksegerdell NF stage 47