Violation
The maxillary labial frenum contains
fibres of the levator labii superioris muscle
fibres of the orbicularis oris muscle
fibres of the levator anguli oris muscle
no muscle fibres
The maxillary labial frenum contains
fibres of the levator labii superioris muscle
fibres of the orbicularis oris muscle
fibres of the levator anguli oris muscle
no muscle fibres