Transversus Menti
Head & Face
A rare/variable chin muscle — many people don't have it. When present, it may deepen chin creases with expression.
Function
May assist mentalis in wrinkling/protruding chin skin
Origin
Fibers crossing between right and left mentalis regions
Insertion
Skin/fascia of chin across midline
Innervation
Facial nerve (CN VII), likely marginal mandibular branches