Overview
Botulinum toxin lifting of the lower face and neck is usually explained as releasing the platysma's downward pull. The author argues that this is incomplete because the platysma's extension into the face is broad, variable and often asymmetric. The commentary offers an anatomical rationale, a pattern-based classification and a conservative treatment algorithm. It reports no patient data.
Findings
- Visible platysma contraction patterns can be straight, straight-curved or curved.
- In a straight, vertical pattern, the platysma pulls down on the jaw border, mouth corner and jowl. Weakening it can improve the jawline.
- In a curved, backward-pulling pattern, the fibers may provide a backward support vector.
- Weakening a curved pattern without selection may remove support, with minimal lifting, collapse of the front soft tissue, more fullness under the chin or more visible sagging.
- Treatment should start with a dynamic examination, not a fixed injection grid.
- Patients should be examined upright at rest and at maximum contraction, noting skin movement direction, active band location and dominant vector.
- Ultrasound can confirm muscle position, band thickness, gliding and relation to deeper structures.
What it means for a patient
- Botulinum toxin to lift the jawline may not work the same for everyone, and in some patterns it may make sagging look worse.
- Expect the injector to watch your neck at rest and when you tense it before deciding where to inject.
- Limits: this is one author's opinion and proposed classification. It has not been tested in patients in this paper.
Why this paper matters
It gives a possible explanation for why botulinum toxin neck and jawline lifting sometimes fails or worsens the contour. It shifts the focus from a standard injection pattern to assessment of each patient's platysma.
Terms
- Platysma: the thin muscle sheet of the neck that extends into the lower face.
- Botulinum toxin A (neuromodulator): an injected protein that relaxes muscles.
- Depressor: a muscle that pulls tissue downward.
- Vector: the direction of pull.
- Oral commissure: the corner of the mouth.
- Platysmal bands: visible vertical cords in the neck from the platysma muscle.
- Dynamic examination: assessing the face while the muscles are moving.
- Submental fullness: fullness under the chin.