An intermediate-level anatomical and clinical guide for aesthetic injectors
Introduction
The midface is the structural and aesthetic centre of the face. It influences youthfulness, contour, light reflection, and the appearance of adjacent regions including the tear trough, nasolabial fold, and jawline. Age-related changes in the midface are among the earliest and most visible signs of facial ageing, driven by skeletal resorption, fat compartment deflation, ligament laxity, and soft tissue descent. Modern anatomical research has transformed our understanding of the midface from a single volumetric unit into a complex system of discrete fat compartments with distinct biomechanical behaviours.
As Rohrich, Avashia, and Savetsky (2021) describe in their review of facial fat compartments and ageing prediction, each compartment contributes differently to the visible signs of midface ageing, and understanding these compartment-specific changes underpins rational treatment planning.
For injectors, the midface is both an opportunity and a challenge. Correctly placed filler can restore youthful contours, support adjacent regions, and improve overall facial harmony. However, poor technique or incorrect plane selection can lead to complications such as oedema, contour irregularities, or vascular compromise. This blog synthesises the latest evidence to guide injectors in safe, anatomically precise midface augmentation. For structured clinical training in midface technique, the
For structured clinical training in midface technique, the Acquisition Aesthetics curriculum covers fat compartment anatomy, layer-specific injection strategy, and complication avoidance across all levels of training.
The Midface as a Multilayered Structure
The midface consists of five anatomically and biomechanically distinct layers:
- Skin
- Superficial fat compartments
- SMAS and mimetic muscles
- Deep fat compartments
- Periosteum and bone
Each layer contributes differently to ageing and responds differently to filler placement. This five-layer model, now standard in aesthetic medicine, provides the architectural framework for depth-specific injection strategy.
Deep Fat Compartments: The Foundation of Midface Volume
The deep fat compartments provide structural support and are the primary targets for midface volumisation. Trévidic et al. (2022), using a novel “smiling cadavers” approach to map fat compartment dynamics during facial animation, demonstrated that filler placement in deep fat compartments produces natural projection both at rest and during expression — a critical finding for achieving results that hold up under facial movement.
1. Deep Medial Cheek Fat (DMCF)
- Located over the maxilla
- Major contributor to anterior projection
- Deflates significantly with age
2. Suborbicularis Oculi Fat (SOOF) — Medial and Lateral
- Directly supports the lower eyelid–cheek junction
- Volume loss contributes to tear trough deformity
- Deep medial SOOF is a primary target for periorbital support
3. Buccal Fat Extensions
- Provide midface fullness
- Atrophy contributes to midface flattening and shadowing
Clinical relevance
Deep compartments are ideal for:
- Structural lift
- Restoring anterior projection
- Supporting the tear trough
- Reducing nasolabial fold prominence
Deep injections provide the most natural and long-lasting results, with product behaviour governed by the biomechanical stability of compartment boundaries.
Superficial Fat Compartments: Contour and Soft Tissue Dynamics
Superficial fat compartments are more mobile and prone to descent. Key compartments include:
- Medial cheek fat
- Middle cheek fat
- Nasolabial fat
- Lateral cheek fat
These compartments are separated by fibrous septa, which influence filler spread and must be understood to avoid overfilling and migration. The surface-volume coefficient — the ratio of skin surface change to injected volume — varies by compartment, meaning the same volume produces very different surface effects depending on where it is placed.
Clinical relevance
Superficial injections are useful for:
- Contour blending
- Softening transitions between adjacent regions
- Refining cheek shape
However, they carry a higher risk of:
- Oedema
- Contour irregularities
- Overfilling due to filler spread within compartment boundaries
Ligamentous Anatomy: The Midface Support System
The midface contains several key retaining ligaments that directly influence ageing patterns and filler outcomes:
1. Orbicularis Retaining Ligament (ORL)
- Separates the lower eyelid from the cheek
- Major anatomical contributor to tear trough deformity
- Must be respected when injecting the tear trough or upper midface
2. Zygomatic Cutaneous Ligament
- Supports the lateral cheek
- Laxity contributes to midface descent and cheek ptosis
3. Masseteric Cutaneous Ligament
- Influences lower cheek contour
- Forms a boundary between the midface and lower face
Clinical relevance
Ligaments create transition zones where filler placement must be precise to avoid contour irregularities. Injections medial to the line of ligaments tend to produce projection, while those lateral to the line produce a lifting effect — a critical distinction for technique selection.
Vascular Anatomy and High-Risk Zones
The midface contains several important vessels whose anatomical course must be understood to minimise vascular risk. Sun et al. (2024) evaluated the infraorbital vascular anatomy in 84 hemifacial specimens using computed tomography, mapping the distribution of the infraorbital artery across four anatomical segments and identifying that the deepest segment — closest to the periosteum — had the lowest arterial density, supporting supraperiosteal injection as the safest approach in this region.
Key vessels
- Facial artery — ascending towards the angular artery, variable course in the nasolabial region
- Infraorbital artery — emerging from the infraorbital foramen with multiple branches supplying the midface and upper lip
- Transverse facial artery — running laterally across the midface
High-risk zones
- Area directly over the infraorbital foramen
- Medial cheek near the angular artery
- Nasolabial fold region
Safer zones
- Deep lateral cheek (away from major vessels)
- Deep medial cheek — supraperiosteal
- Lateral SOOF
Injection Strategy Based on Anatomy
Trévidic, Kaufman-Janette, Weinkle et al. (2022) proposed the ATP framework — Anatomy, Techniques, Products — as a structured approach to midface injection, emphasising that each of the five midface layers has distinct rheological requirements. Their multilayering algorithm targets the deep fat compartments first for structural support, followed by the superficial compartments for contour blending.
1. Deep Structural Augmentation
Ideal for:
- Restoring projection
- Lifting the midface
- Supporting the tear trough
Technique:
- Supraperiosteal boluses
- High G′ filler
- Slow, controlled injection
2. Superficial Contour Blending
Useful for:
- Smoothing transitions
- Enhancing cheek shape
Technique:
- Low to medium G′ filler
- Cannula preferred
- Small aliquots
3. Avoiding Oedema
The midface is prone to swelling due to lymphatic drainage patterns and filler hydrophilicity. Galadari and Weinkle (2022) highlighted the importance of filler-specific dynamic properties in the midface, noting that products with higher stretch and lower hydrophilicity are better suited to this region, particularly in patients with existing malar oedema or periorbital laxity.
Choose fillers with:
- Low hydrophilicity
- Appropriate cohesivity for the target plane
4. Supporting Adjacent Regions
Midface augmentation can improve:
- Tear trough appearance
- Nasolabial fold depth
- Jawline contour
This makes midface volumisation a foundational treatment in full-face rejuvenation, with effects that cascade through adjacent aesthetic units.
Summary for Injectors
• The midface consists of distinct deep and superficial fat compartments with different ageing patterns. Compartment-specific deflation drives the visible changes of midface ageing (Rohrich et al., 2021).
• Deep compartments — DMCF, medial and lateral SOOF — are ideal for structural augmentation. Filler in deep compartments produces natural projection at rest and during animation (Trévidic et al., 2022).
• Superficial compartments require careful technique to avoid oedema and irregularities. Product selection, volume, and layer must be matched to the specific compartment.
• Key ligaments — ORL, zygomatic cutaneous — define transition zones that determine whether injection produces projection or lift. The ATP approach (anatomy, techniques, products) provides a structured multilayer algorithm for safe and effective results (Trévidic, Kaufman-Janette et al., 2022).
• The infraorbital artery and angular artery represent major high-risk zones. The supraperiosteal plane carries the lowest arterial density in the infraorbital region and is the safest approach near the foramen (Sun et al., 2024).
• Product selection matters: low hydrophilicity and appropriate dynamic properties reduce the risk of malar oedema and improve outcomes during facial movement (Galadari & Weinkle, 2022).
| Master the Midface with Anatomically Grounded Training The midface is where natural results are won or lost. Getting it right demands more than volume — it requires a precise understanding of fat compartments, ligamentous architecture, vascular risk zones, and rheological matching. At Acquisition Aesthetics, these principles are embedded in every level of our training, from Foundation to Level 7. Whether you’re developing midface technique from scratch or refining your approach to the periorbital region and deep fat compartments, our clinically led courses give you the anatomical confidence to treat safely and achieve consistently natural outcomes. ➤ Explore Our Courses and Book Your Place acquisitionaesthetics.co.uk/courses |
References
Galadari H, Weinkle SH. Injection techniques for midface volumization using soft tissue hyaluronic acid fillers designed for dynamic facial movement. J Cosmet Dermatol. 2022;21(3):924–932. PubMed
Rohrich RJ, Avashia YJ, Savetsky IL. Prediction of facial aging using the facial fat compartments. Plast Reconstr Surg. 2021;147(1S-2):38S–42S. PubMed
Sun Y, Peng X, Gan X, Ye Z, Tan X, Huang J. The safety of injections in the infraorbital region. Aesthetic Plast Surg. 2024 [epub ahead of print]. PubMed
Trévidic P, Kaufman-Janette J, Weinkle S, Wu R, Dhillon B, Antunes S, Macé E, Maffert P. Injection guidelines for treating midface volume deficiency with hyaluronic acid fillers: the ATP approach (anatomy, techniques, products). Aesthet Surg J. 2022;42(8):920–934. PubMed
Trévidic P, Trévidic T, Imanilov A, Criollo-Lamilla G. Midface multilayering filler injection technique: understanding of the dynamic facial anatomy through a “smiling cadavers” anatomical study. Plast Reconstr Surg. 2022;149(6):1326–1336. PubMed