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What Is Temporalis Muscle Transfer?

Temporalis muscle transfer is a dynamic facial-reanimation operation that redirects force from the temporalis chewing muscle to the corner of the mouth. Modern versions commonly move the temporalis tendon or muscle-tendon unit from its attachment on the mandibular coronoid process and secure it to tissues around the lips. Because the temporalis muscle is powered by the trigeminal nerve rather than the damaged facial nerve, it can create movement even in long-standing facial paralysis. The procedure is usually completed in one stage and does not require waiting for regeneration of the original facial nerve.

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What Is Temporalis Muscle Transfer?

Temporalis muscle transfer is a dynamic facial-reanimation operation that redirects force from the temporalis chewing muscle to the corner of the mouth. Modern versions commonly move the temporalis tendon or muscle-tendon unit from its attachment on the mandibular coronoid process and secure it to tissues around the lips. Because the temporalis muscle is powered by the trigeminal nerve rather than the damaged facial nerve, it can create movement even in long-standing facial paralysis. The procedure is usually completed in one stage and does not require waiting for regeneration of the original facial nerve.

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Why Is Temporalis Muscle Transfer Performed?

The procedure is used for established facial paralysis when native facial muscles have lost useful innervation or when nerve repair is unlikely to restore a dependable smile. It can be chosen for older patients, people who are not good candidates for free functional muscle transplantation, or patients who prefer a single-stage local reconstruction. Goals include improving oral-commissure elevation, resting symmetry, lip competence, speech, and the ability to produce a voluntary smile. Treatment planning considers the duration and cause of paralysis, available temporalis strength, facial symmetry, previous operations, and whether eye or static suspension procedures are also needed.

How Is Temporalis Muscle Transfer Performed?

The surgeon exposes the temporalis tendon near its insertion on the mandibular coronoid process through an intraoral or small facial approach. The tendon and attached muscle-tendon unit are mobilized while preserving the blood supply and motor innervation of the temporalis muscle. The transferred tendon is lengthened or redirected and secured near the oral commissure and upper or lower lip at a carefully selected tension. Intraoperative assessment of excursion and symmetry helps position the transfer so jaw activation can elevate the paralyzed side of the mouth.

What Is Recovery Like After Temporalis Muscle Transfer?

Swelling, facial tightness, chewing discomfort, and temporary limitation of mouth opening can occur during early healing. Once the tendon attachment is secure, facial-retraining therapy teaches the patient to activate the temporalis muscle to lift the corner of the mouth. Early smiles usually require conscious jaw clenching, but repeated therapy can make the movement faster and more natural through motor retraining. Improvement in symmetry and smile excursion continues as swelling resolves and the transferred muscle adapts to its new length and task.

What Are the Risks and Complications?

Possible complications include infection, bleeding, scarring, facial asymmetry, limited smile excursion, and recurrence of oral-commissure droop. Temporal hollowing, cheek fullness, jaw discomfort, trismus, or contour changes can occur because a chewing muscle is being repurposed. The transferred tendon can stretch, scar, detach, or heal at an unfavorable tension and can require revision. The reconstructed smile is usually voluntary rather than truly spontaneous because activation originates from a chewing motor pathway.

Frequently Asked Questions About Temporalis Muscle Transfer

How does the temporalis muscle create a smile?

The transferred tendon connects temporalis muscle force to the lips, so contracting the chewing muscle pulls the paralyzed corner of the mouth upward.

Is temporalis transfer used for long-standing facial paralysis?

Yes. It is particularly useful when chronic denervation has made the original facial muscles poor candidates for direct nerve reinnervation.

Does temporalis muscle transfer restore a spontaneous emotional smile?

Usually not. The smile is powered by a chewing nerve pathway and is initially produced consciously, although therapy can make activation more automatic over time.

Is rehabilitation needed after temporalis transfer?

Yes. Facial-retraining therapy helps the patient learn the new movement pattern, improve symmetry, and maximize oral-commissure excursion.

References

Principles and biomechanics of muscle tendon unit transfer: application in temporalis muscle tendon transposition for smile improvement in facial paralysis. PubMed. https://pubmed.ncbi.nlm.nih.gov/23208742/. Date Accessed September 11, 2026.

Smile Asymmetry and Eyelid Closure Following Temporalis Muscle Transfer for Facial Reanimation: A Systematic Review and Meta-Analysis. PubMed. https://pubmed.ncbi.nlm.nih.gov/41927316/. Date Accessed September 11, 2026.

State of the art in treatment of facial paralysis with temporalis tendon transfer. PubMed. https://pubmed.ncbi.nlm.nih.gov/23842289/. Date Accessed September 11, 2026.

Temporalis Muscle Tendon Unit Transfer for Smile Restoration After Facial Paralysis. PubMed. https://pubmed.ncbi.nlm.nih.gov/26611700/. Date Accessed September 11, 2026.

Temporalis tendon transfer as part of a comprehensive approach to facial reanimation. PubMed. https://pubmed.ncbi.nlm.nih.gov/17638756/. Date Accessed September 11, 2026.