Layers of the face: skin, fat, SMAS, ligaments and bone
Quick facts
- Definition
- The face organized in stacked planes, from the skin down to the bone.
- Layers
- Skin, subcutaneous fat, SMAS and muscles, spaces and retaining ligaments, periosteum or deep fascia, bone.
- Fat
- Divided into superficial compartments (above the SMAS) and deep compartments (below the muscles).
- Facial nerve
- Runs beneath the SMAS and reaches the muscles of expression from their deep surface.
- Relevance in facial harmonization
- Explains aging, the choice of plane and where vessels and nerves lie, at a review level.
The layers of the face are the stacked tissue planes that run from the skin to the bone. The most common description organizes the face into five layers, similar to those of the scalp: skin, subcutaneous fat, SMAS with the muscles of expression, a layer of spaces and retaining ligaments, and the periosteum or deep fascia over the bone. Understanding this organization helps in reading aging and in locating vessels, nerves and fat compartments.
What are the layers, in order?
| Layer | What it contains | Point of attention |
|---|---|---|
| 1. Skin | Epidermis and dermis; thickness varies a lot between areas | Thin on the eyelids, thick on the nose and glabella |
| 2. Subcutaneous fat | Superficial fat compartments, separated by septa | Compartments age at different rates |
| 3. SMAS and muscles | Musculoaponeurotic system and muscles of expression | Continuous with the platysma in the neck and with the superficial temporal fascia at the temple |
| 4. Spaces and ligaments | Gliding spaces and retaining ligaments; deep fat | Branches of the facial nerve cross this layer to reach the muscles |
| 5. Periosteum or deep fascia | Membrane over the bone or fascia over deep muscles, such as the masseter | The base on which the ligaments anchor |
Below the five layers lies the skeleton, which also changes with age and supports everything above it.
What are the deep fat compartments?
Beneath the muscles of expression there are compartments of their own, such as the SOOF under the orbicularis oculi, the deep medial cheek fat and the buccal fat pad, between the masseter and the buccinator. They support the superficial layer. When they lose volume or descend, the fat above loses its support and the shape of the face changes.
Where are the ligaments and spaces?
Retaining ligaments are fibrous bands that leave the bone or deep fascia and cross the layers up to the skin, working as anchor points. Between them lie gliding spaces, which allow facial expression to move. At the lower edge of the orbit, for example, the orbicular retaining ligament separates the eyelid from the cheek. Many visible grooves, such as the transition between eyelid and cheek and the outline of the jaw, appear where ligaments hold the skin while the surrounding tissues descend.
Why do the layers matter in facial harmonization?
- Aging: each layer changes in its own way (skin thins, fat redistributes, ligaments loosen, bone remodels). The sum explains the aged face. The clinical reading by layers is in facial aging by layers.
- Nerves: the facial nerve runs beneath the SMAS and reaches the muscles from their deep surface, with points where it is more exposed.
- Vessels: arteries change layers along their course, sometimes deep, sometimes superficial, and vary between people.
- Planning: the layer you want to act on changes the product and the technique, a decision for the licensed professional.
How does it show up in the assessment?
Skin is assessed by thickness, texture and elasticity; fat, by volume and position at rest and in motion; ligaments, by the grooves they mark; and bone, by profile and support. Front, three-quarter and profile photos, taken with standardized lighting, help separate what belongs to each layer.
Also called: facial planes, facial layers, layered anatomy of the face.
Frequently asked questions
What are the layers of the face?
From the surface to the depths: skin, subcutaneous fat, SMAS with the muscles of expression, a layer of spaces and retaining ligaments, periosteum or deep fascia and, finally, bone. There are also deep fat compartments below the muscles.
What is the SMAS?
It is the superficial musculoaponeurotic system: a fibrous and muscular layer that wraps the muscles of expression and organizes the face. It connects the platysma in the neck to the superficial temporal fascia at the temple.