Mandibular ligament: anatomy and the jawline
- Nerve
- Highlighted area
Quick facts
- Type
- True retaining ligament (osteocutaneous): connects bone directly to skin.
- Location
- Anterior third of the body of the mandible, slightly above the lower border, between the chin and the jowl.
- Function
- Anchors the skin of the front of the jaw and resists the descent of tissues.
- With aging
- Stays firm while the tissue beside it descends, which marks the pre-jowl sulcus.
- Relevance in HOF
- Defines the anterior boundary of the jowl and helps explain the break in the jawline.
The mandibular ligament is a retaining ligament that anchors the skin directly to the bone in the front part of the body of the mandible, slightly above the lower border, between the chin and the jowl region. It is one of the true retaining ligaments of the face, called osteocutaneous because they run from bone to skin without depending on other layers. In HOF, it explains why the jawline breaks with aging at a predictable point.
Where is it and how is it formed?
The ligament has been described in surgical facial anatomy as a set of strong fibers that leave the periosteum in the anterior third of the mandible, cross the fat and the platysma, and insert into the dermis. Being short and firm, it keeps the skin of the area attached to the bone.
| Reference | Relationship to the mandibular ligament |
|---|---|
| Chin | In front, medial to the ligament |
| Jowl | Behind and above, between the mandibular ligament and the masseteric ligaments |
| Pre-jowl sulcus | Depression over the point where the ligament anchors the skin |
| Marionette line | Descends from the corner of the mouth and usually ends in the region of the ligament |
| Depressor anguli oris muscle | Originates on the border of the mandible, in the same region |
The exact position and strength of the fibers vary between people and between sides. The numbers described in dissection studies serve for anatomical review, not as an injection reference.
Why does it matter in HOF?
With aging, the masseteric ligaments, further back, loosen, and the tissues between them and the mandibular ligament descend. The mandibular ligament, meanwhile, keeps holding the skin in place. The contrast between the tissue that has descended and the point that stayed anchored creates the typical pattern of the aging lower third: the jowl behind and the pre-jowl sulcus in front.
That is why contour assessment usually separates three things: the volume that has descended, the depression over the ligament, and the lack of bony projection of the chin and jaw. The plan may involve support at the jaw and the chin, camouflaging the sulcus and treating laxity, at the discretion of the qualified professional. The full view of the lower third is in lower third laxity.
How does it appear in the assessment?
- Frontal and oblique view: show the depression in front of the jowl and whether it is symmetrical.
- Palpation: sliding a finger along the edge of the jaw, you can feel the point where the skin is more tightly anchored.
- Lifting maneuver: gently lifting the midface tissues shows how much of the sulcus is descended weight and how much is a lack of local volume.
- Profile: helps to see the relationship with chin projection.
Also called: mandibular retaining ligament, mandibular osteocutaneous ligament, mandibular ligament.
Frequently asked questions
Where is the mandibular ligament?
In the front part of the body of the mandible, slightly above the lower border of the bone, between the chin and the jowl region. It runs from the bone to the skin, anchoring it at that point.
What is the relationship between the mandibular ligament and the jowl?
The mandibular ligament is the front boundary of the jowl. Because it keeps the skin attached to the bone, the tissue that descends behind it forms the volume of the jowl, and the anchored area forms the depression called the pre-jowl sulcus.