Related Experiment Videos
The submuscular aponeurotic system (SMAS): a histologic and comparative anatomy evaluation
S R Thaller1, S Kim, H Patterson
1Department of Surgery, University of California, Davis.
Plastic and Reconstructive Surgery
|October 1, 1990
Summary
This study clarifies the existence of the submuscular aponeurotic system (SMAS). Anatomical dissections in cadavers and comparative studies confirm the SMAS as a distinct fibromuscular layer.
Area of Science:
- Anatomy
- Surgical Anatomy
- Histology
Background:
- The submuscular aponeurotic system (SMAS) has been a subject of debate in anatomical and surgical literature.
- Clarifying the SMAS's existence and composition is crucial for facial plastic surgery procedures.
Purpose of the Study:
- To definitively establish the existence and anatomical characteristics of the SMAS.
- To elucidate the SMAS's relationship with adjacent facial structures.
Main Methods:
- Microscopic dissections were performed on 10 fresh human cadaver heads (20 hemiheads) via facelift incisions.
- Histological analysis of full-thickness SMAS sections was conducted.
- Comparative anatomical dissections were performed on 12 rhesus monkey fetuses.
Main Results:
- The SMAS was identified as a distinct fibromuscular layer.
- The SMAS was found to be composed of the platysma muscle, parotid fascia, and a cheek-covering fibromuscular layer.
- Its relationship with surrounding anatomical structures was mapped.
Conclusions:
- The study provides strong anatomical evidence for the existence of the SMAS.
- The SMAS is a well-defined fibromuscular layer integral to facial anatomy.
- Findings support the SMAS as a key anatomical landmark in facial surgery.