Submuscular plane: what it means in injection
Quick facts
- Definition
- Layer deep to the muscle, between the muscle and the underlying bony or fascial plane.
- Role
- Houses vessels, nerves and deep fat of clinical importance.
- Comparison
- Deeper than the subcutaneous plane; more superficial than or close to the supraperiosteal plane, depending on the area.
- Point of attention
- Requires detailed anatomical knowledge; the choice of plane belongs to the qualified professional.
The submuscular plane is the layer that lies just below a muscle of expression, between it and the deeper structures. It is a classification term used in anatomy and in HOF to describe the level at which a product is deposited. It belongs to the professional's vocabulary and a public page does not indicate when or where to use it.
How does this plane fit into the layers?
The face is organized in layers, from skin to bone: skin, subcutaneous tissue, musculoaponeurotic layer (SMAS) and muscles, deep spaces and, finally, bone. The submuscular plane lies below the muscle, and the absolute depth varies a lot by area. See layers of the face.
| Plane | Relative position |
|---|---|
| Intradermal | Within the skin |
| Subcutaneous | Under the skin, in the fat |
| Submuscular | Under the muscle of expression |
| Supraperiosteal | On the bone |
What exists in this plane?
Below the muscles there is a series of relevant structures: deep fat, retaining ligaments, larger-caliber vessels and nerve branches. The anatomy varies between areas, for example:
- In the forehead, below the frontalis there is a relatively avascular plane, but with supraorbital and supratrochlear nerves and vessels nearby.
- In the periorbital area, below the orbicularis oculi lie the deep fat compartments and delicate structures.
- In the cheek, below the zygomaticus muscles there are spaces and deep fat.
- In the lower third, the masseter has deep planes of its own.
The description above is general anatomy, and does not indicate where or how to inject. The technical decision belongs to the qualified professional, after assessment, according to the rules of their professional council.
Why does this matter for anyone planning?
The plane influences the type of effect and the risk profile.
- Support effect: products in deep planes tend to give structural support, rather than change the surface.
- Vascular risk: larger-caliber vessels run in deep planes, and vascular occlusion can have serious consequences.
- Recovery: deep planes tend to have swelling that resolves differently from superficial ones, with less visible irregularity but greater dependence on technique.
- Reversibility: hyaluronidase acts on hyaluronic acid, but availability and a quick response matter more than any plane.
Also known as: plane deep to the muscle, submuscular layer.
Frequently asked questions
Is the submuscular plane the same as the supraperiosteal plane?
No. The submuscular plane lies just below the muscle. The supraperiosteal plane lies on the bone. In some areas the two are close, in others there is fat or other structures between them.