Cleft mouth
As a mouth opening ( Latin Rima oris ) is called by the lips enclosed opening of the mouth . The upper lip ( labium superius ) with its Cupid's bow borders on both sides in the corner of the mouth ( angulus oris ) on the lower lip ( labium inferius ). The transition from the upper to the lower lip is called the commissura labiorum .
The cleft lip is also sometimes referred to as the cleft mouth.
The movements of the mouth cleft are made by parts of the facial muscles . The orbicularis oris muscle, embedded in the lips, causes the closure . As a result of the soft lips, the closure can also take place around an object, which is a prerequisite for sucking. The opening of the mouth gap occurs passively by downward movement of the lower jaw on both sides in the jaw joint . Lower lip pullers ( Musculus depressor labii inferioris ), mouth corner pullers ( Musculus depressor anguli oris ) and neck skin muscles take care of the downward movement of the lower lip and corners of the mouth . The lateral displacement of the corner of the mouth and thus the widening of the mouth gap is realized by the neck skin muscle and the large zygomatic muscle ( Musculus zygomaticus major ), the laughing muscle ( Musculus risorius ) is hardly involved. The lifting of the upper lip and the corner of the mouth are made possible by the lift of the upper lip ( Musculus levator labii superioris ), the corner of the mouth ( Musculus levator anguli oris ) and the zygomatic muscles .
Individual evidence
- ↑ a b Walther Graumann: Compact Textbook Anatomy . Volume 3, Schattauer Verlag, 2004, ISBN 978-3-7945-2063-3 , p. 6.
- ^ Günter Thiele (Ed.): Handlexikon der Medizin , Urban & Schwarzenberg , Volume 3 (L – R), Munich, Vienna, Baltimore without year, p. 1638.
- ↑ Herbert Lippert: Anatomy on the living: An exercise program for medical students . Springer-Verlag, 2013, ISBN 978-3-662-00661-0 , p. 189.