Ultrasonographic findings of facial muscles in patients with severe facial palsy who showed no improvement for more than 3  months on acute stage

This study confirmed that the zygomaticus major, zygomaticus minor, and levator labii suprioris muscles, which raise the corner of the mouth, are the first to degenerate in patients with severe facial paralysis. This study demonstrated that ultrasonography is a simple and non-invasive examination for facial paralysis.
Source: European Archives of Oto-Rhino-Laryngology - Category: ENT & OMF Source Type: research