namely , atresia of the external auditory canal , aberrant course of the tensor tympani muscle , malformed stapes , aberrant course of the facial nerve with an obtuse angulation at the first genu and displacement of geniculate ganglion cells into the internal auditory canal , shortened cochlea with decreased spiral ganglion cell population , and vestibular anomalies , such as bony and membranous blockage of the superior semicircular canal .
C0015462
facial nerve
C0017406
geniculate ganglion