The Neuromuscular Junction Distribution in the Upper Face: An Anatomy-to-Practice Review to Inform Botulinum Toxin Type A Treatment Planning - PubMed
3 days ago
- #neuromuscular-junction
- #facial-anatomy
- #botulinum-toxin
- Upper-face botulinum toxin treatment planning typically uses surface landmarks and standardized injection patterns.
- Neuromuscular junctions (NMJs) are distributed in muscle-specific motor zones that vary in topography, depth, and overlap, and targeting optimal zones may enhance clinical effects.
- A review synthesized anatomical evidence on NMJ clustering in muscles like frontalis (mid- to upper-belly, deep surface), corrugator supercilii (medial portion, greater depth), orbicularis oculi (diffuse), procerus (inferior near nasion), and depressor supercilii (central/inferior along orbital rim).
- NMJs form nonuniform, muscle-specific patterns, from discrete clusters to diffuse fields, interpreted as probabilistic fields due to heterogeneous mapping data.
- Understanding NMJ distribution can complement dynamic assessment and clinical judgment to refine botulinum toxin targeting and reduce treatment variability.