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FIG 6. Temporal bone photomicrographs showing temporal bone structures in an axial plane. (Courtesy of Dr. Barbara A. Bohne at the Washington University in St. Louis School of Medicine)
A, A nonosseous cleft is in the lateral part of the cochlear otic capsule (arrow). Ear structures visible are the carotid artery (CA), cochlea (CO), eustachian tube (ET), facial nerve (FN), foot plate of the stapes (FP), internal auditory canal (IAC), tympanic membrane (TM), tensor tympani muscle (TT), and vestibule (VE).
B, Enlarged view of the cochlea. The cochlear cleft (CC) is in the middle layer of the otic capsule. The base turn (BT) and middle turn (MT) of the cochlea are adjacent to the cleft.
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