Muscle
Temporalis
Fan-shaped jaw elevator and retractor
High-yield
The direction of the fibers helps explain the action: the more vertical fibers elevate the jaw, while the posterior, more horizontal fibers assist retraction. Motor supply comes from V3.
Overview
Temporalis spreads across the temporal fossa and narrows into a tendon passing beneath the zygomatic arch. Its pull on the mandibular coronoid process closes the jaw; posterior fibers also draw the mandible backward.
Reference facts
- Origin
- Temporal fossa and deep surface of the temporal fascia
- Insertion
- Coronoid process and anterior border of the mandibular ramus
- Action
- Elevates the mandible; posterior fibers help retract it
- Innervation
- Deep temporal branches of the mandibular division of CN V (V3)
- Blood supply
- Deep temporal branches of the maxillary artery
Clinical correlation
Loss of temporalis bulk can produce hollowing at the temple. Trigeminal motor injury is one possible cause, but aging and local tissue changes can also alter this contour.
Frequently asked questions
What does the temporalis do?
Elevates the mandible; posterior fibers help retract it.
What nerve innervates the temporalis?
Deep temporal branches of the mandibular division of CN V (V3).
Where does the temporalis attach?
The temporalis originates from the temporal fossa and deep surface of the temporal fascia and inserts on the coronoid process and anterior border of the mandibular ramus.
What is the blood supply of the temporalis?
Deep temporal branches of the maxillary artery.