Microscopic surgical anatomy of the stapedius muscle in fresh cadaveric temporal bone: Our experiences

Introduction: Stapedius muscle is the smallest bone in the human body and it has an important role for preventing loud noise exposing to the inner ear. This stapedius muscle has also a very significant role during stapes surgery for otosclerosis. Materials and Methods: We studied the microscopic anatomy of the 36-stapedius muscle at our temporal bone dissection laboratory during the period of March 2019 to April 2021. All the 36 fresh temporal bones were dissected with the help of the microdrill, burr, and Zeiss microscope. Details of the stapedius muscle anatomy such as origin, extension, and attachment were studied. Results: The length of the stapedius muscle was ranging from 8 to 11 mm. The tendon of the stapedius muscle was ranging from 1.5 to 2.5 mm. The classical shape of the stapedius muscle was sickle shape. The bulky bell of the stapedius muscle was from 1.5 to 3.5 mm. Discussion and Conclusion: Clear anatomical knowledge of the stapedius muscle is needed for the postgraduates and during learning period of the otologist. If anatomical knowledge is not clear, it may lead to confusion between the stapedius muscle and facial nerve. Awareness regarding microscopic anatomic is required for avoiding the confusion between the facial nerve and stapedius muscle or during the facial nerve grafting.