Surgical landmarks for the facial nerve

Area of Science:

• Neurosurgery
• Anatomy

Background:

• The facial nerve (CN VII) is crucial for facial expression and motor control.
• Surgical exposure of the facial nerve is necessary for various procedures, including tumor resection and trauma repair.
• Accurate identification of facial nerve landmarks is essential to prevent iatrogenic injury.

Purpose of the Study:

• To outline key anatomical landmarks for safe facial nerve exposure.
• To differentiate landmarks used in parotidectomy versus middle fossa approaches.
• To emphasize the importance of utilizing multiple landmarks for surgical safety.

Main Methods:

• Review of anatomical literature and surgical approaches for facial nerve identification.
• Description of landmarks utilized in parotidectomy (extratemporal approach).
• Description of landmarks utilized in middle fossa approach.

Main Results:

• Key landmarks for extratemporal facial nerve identification include the tragal pointer, lateral semicircular canal, chorda tympani nerve, digastric ridge, and cochleariform process.
• Key landmarks for middle fossa approach include the superior semicircular canal, greater petrosal nerve, and the tegmen tympani.
• Multiple landmarks enhance the safety and accuracy of facial nerve dissection.

Conclusions:

• Safe surgical exposure of the facial nerve relies on a thorough understanding of relevant anatomical landmarks.
• The choice and application of landmarks are dictated by the specific surgical approach and pathology.
• Surgeons should integrate multiple identified landmarks to ensure optimal patient outcomes and minimize nerve damage.