In the human face, there is a mysterious tissue structure called SMAS buried, as a long list of English word abbreviation, it has always maintained a low-key luxury and connotation style. The full name of SMAS is Superficial Musculo-Aponeurotic System (SMAS). Strictly speaking, SMAS is not a clear anatomical structure, it is a layer of continuous muscle fibers, which is often manifested as a fascia. Peyronie.The emergence of the SMAS concept has allowed us to better understand the facial fascial layer. It is called superficial muscular fascia because myofibrillar tissue is occasionally visible in the fascia on the surface of the parotid gland. The SMAS consists of a layer of fascial fascia surrounded by a fibrous sheath that extends into the dermis where a fibrous septum connects to the skin, allowing the muscle to regulate facial expression (see figure below). It is the existence of the fibrous septum between the SMAS and the skin that ensures that the ultrasonic scalpel can achieve the effect of facial lifting and skin tightening through the thermal effect on the SMAS. Facial SMAS cross-section Having said that, you may still not have much understanding of the importance of the SMAS, so let’s talk about the main role of the SMAS. The SMAS creates a certain amount of tension in the facial muscles and is able to transmit this tension to the facial skin. When a certain expression muscle contracts, the other expression muscles connected to the SMAS are stretched due to the transmission of tension from the intermediate muscles. This results in complex, varied, and long-lasting facial expressions. If you think that this is the only role of the SMAS, then it is too small to see this product, the emergence of the concept of SMAS for the development of wrinkle reduction (commonly known as “facelift”) has played a huge role in promoting the development. It marked the birth of the second generation of wrinkle reduction techniques. SMAS upward over the zygomatic arch and superficial temporal fascia continuation, and then through the superficial temporal fascia and then upward and capitellar tendon membrane continuity, forward up to the orbicularis oculi muscle, frontalis muscle, backward up to the supraspinatus muscle, posterior auricularis muscle and capitellar tendon membrane, downward moving behavior of the cervical latissimus dorsi muscle ……bulabula can also say a lot of tongue-twisting terminology, or to look at the picture! Distribution range of facial SMAS Since SMAS extends with the surrounding superficial muscles, lifting the SMAS of the cheeks while tightening the cervical latissimus dorsi muscle and the sagging skin of the lower jaw can significantly improve the wrinkle removal effect in wrinkle reduction surgery. In all areas of the face, the major blood vessels and nerves have a fixed relationship with the SMAS, and this relationship helps the surgeon to protect important structures and perform surgical procedures in the correct plane. Facial nerve branches travel in the deeper plane of the SMAS, so extensive sub-SMAS detachment is safe. Academics refer to the surgical technique of sub-SMAS detachment and suspension as the second generation of wrinkle reduction. The position of SMAS in the field of repair and reconstruction as well as cosmetic surgery is irreplaceable. By adjusting the SMAS through invasive or non-invasive methods, it can not only tighten the facial skin, but also treat nasolabial folds (lines of decency), congenital ptosis, lower eyelid defects, and other facial disorders brought about by aging, deformity and trauma.