El orbicular de los labios es un músculo bucal que interviene en la expresión facial. Es el principal músculo esfínter de los labios. Inserciones: se origina en el maxilar superior y en los demás músculos de la mejilla. Se inserta sobre la piel y la membrana mucosa de los labios. Acción: cierra los labios para reducir la abertura bucal. Inervación: ramas bucales del nervio facial. Irrigación sanguínea: ramas labiales superior e inferior de la arteria facial. By TeachMeSeries Ltd (2026) Fig. 1: los principales músculos orales de la expresión facial. Obsérvese cómo se mezclan las fibras del buccinador y del orbicular de los labios. Pro Feature - 3D Model You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Pro Feature - Dissection Atlas Prosection of the face, demonstrating the anterior facial muscles. Prosection of the face, demonstrating the anterior facial muscles. You've Discovered a Pro Feature Access our Dissection Image Library Enhance your understanding with high-resolution dissection images showcasing real-life anatomy. Learn More Frequent questions What is the orbicularis oris muscle? The orbicularis oris is a facial muscle that plays a crucial role in facial expression. It acts as the primary sphincter of the lips, enabling actions like closing the mouth. Where does the orbicularis oris muscle originate and insert? This muscle originates from the maxilla and other muscles of the cheek, inserting into the skin and mucous membrane of the lips. Its unique structure allows it to encircle the mouth effectively. What action does the orbicularis oris muscle perform? The orbicularis oris muscle primarily closes the lips, reducing the oral opening. This function is essential for various activities, including speaking and eating. What is the innervation of the orbicularis oris muscle? The orbicularis oris is innervated by the buccal branches of the facial nerve. This nerve supply is vital for the muscle's movement and coordination during facial expressions. How is the orbicularis oris muscle supplied with blood? Blood supply to the orbicularis oris comes from the superior and inferior labial branches of the facial artery. This vascularisation ensures that the muscle receives adequate nutrients and oxygen for its function. Rate This Article