Coronoid process: where the temporalis muscle inserts
- Nerve
- Highlighted area
Quick facts
- Definition
- Triangular bony projection at the top of the mandibular ramus, pointing upward and forward.
- Function
- Insertion point for the tendon of the temporalis muscle, which elevates the mandible during chewing.
- Neighborhood
- Lies in front of the mandibular condyle, separated from it by the mandibular notch, and passes under the zygomatic arch.
- Relevance in HOF
- Helps in understanding the deep anatomy of the temple and the region of the masseter and the mandibular ramus.
The coronoid process is a triangular bony projection located at the upper and anterior part of the ramus of the mandible. It points upward and slightly forward and anchors the tendon of the temporalis muscle. The name comes from its shape, which resembles a crow's beak.
Where exactly is it?
The ramus of the mandible ends at the top in two projections separated by a concavity, the mandibular notch. Behind is the mandibular condyle, which forms the temporomandibular joint. In front is the coronoid process.
It passes beneath the zygomatic arch, under the skin of the lateral face. It cannot be reliably palpated from the outside: it is deep, covered by muscle and soft tissue.
| Structure | Position relative to the coronoid |
|---|---|
| Mandibular condyle | Behind, separated by the mandibular notch |
| Zygomatic arch | Above and lateral; the coronoid passes beneath it |
| Temporalis muscle | Inserts at the apex and the medial surface |
| Temporal fossa | The origin of the temporalis, above; the coronoid is the insertion |
How does it relate to the temporalis muscle?
The temporalis arises in the temporal fossa, is fan-shaped and converges into a strong tendon that attaches to the coronoid process. When the muscle contracts, it elevates the mandible and takes part in chewing, mainly in closing the mouth.
This explains why the temple, which the professional sees as a hollow or an area of volume, is the superficial part of a set that descends to the mandible. Loss of temporal volume depends on the muscle, the temporal fat pad and the bone, and the coronoid is the end point of that chain.
Why does it matter in harmonization?
In orofacial harmonization (HOF) practice, the coronoid is almost never a target. Its value is anatomical orientation: it helps visualize where the temporalis comes from and where it goes, and why the temple region is a vascular risk zone with deep and variable structures.
It is also a reference in imaging. Changes such as coronoid hyperplasia can limit mouth opening and appear in the assessment of temporomandibular dysfunction. If the patient reports trismus or locking, the investigation belongs to a specific medical or dental evaluation, before any aesthetic procedure.
Also called: coronoid apophysis of the mandible.
Frequently asked questions
What is the function of the coronoid process?
To serve as the insertion point of the temporalis muscle. When the temporalis contracts, it pulls the coronoid process upward and elevates the mandible, closing the mouth.