and in 1975, french scientists vladimir mitz and martin perroni published an article that changed thepproach to this procedure. in it, they described the anatomy of the face and for the first time identified such a layer of tissue as lubrication, the superficial muscular neurotic system, the authors suggested. that it is this layer of tissue that plays an important role in the transmission of movement from the facial muscles to the surrounding tissues. this discovery turned out to be because it followed that pulling up it is this layer, and not just the skin, that can achieve the best effect in facial rejuvenation. in 2009, the fda approved a non-invasive smaslifting method, a microfocused ultrasound procedure that is able to penetrate into the same muscle and neurotic layer . ultrasound densifies the existing collagen, and then a new one is produced, so the effect of oiling, as it were, is growing for several more months. generally one procedure is enough for about 18 months and there is no need to lay down time for recovery, so this facelift is sometimes called a weekend facelift be