2.1
Facial muscles – buccolabial muscle group
4
Levator anguli oris (musculus levator anguli oris) O: maxilla – anterior surface (canine fossa) I: modiolus F: elevates the angle of the mouth, producing smile N: facial nerve – buccal branches
Risorius (musculus risorius) O: masseteric fascia I: modiolus F: moves the angle of the mouth laterally, stretches the oral opening, producing smile N: facial nerve – buccal branches
Depressor anguli oris (musculus depressor anguli oris) O: mandible – inferior border I: modiolus F: depresses the angle of the mouth, producing an expression of sadness N: facial nerve – marginal mandibular branch
Depressor labii inferioris (musculus depressor labii inferioris) O: mandible – inferior border (under the depressor anguli oris) I: skin of the lower lip F: depresses the lower lip and pulls the lower lip laterally, producing an expression of contempt N: facial nerve – marginal mandibular branch
Mentalis (musculus mentalis) O: mandible – alveolar yokes of the 2nd incisor I: skin of the chin (fibres run mediocaudally) F: pulls the lower lip upwards and foward, producing an expression of scorn N: facial nerve – marginal mandibular branch
Buccinator (musculus buccinator) O: maxilla and mandible – alveolar yokes of the molars, pterygomandibular raphe (fibres running from the pterygoid hamulus to the medial surface of the border between the body and ramus of the mandible) I: modiolus, fibres of the orbicularis oris of both the upper and lower lips F: presses the cheeks against the teeth and gums (moves food between the molars), squeezes air out of the oral cavity when the mouth is open, prevents compression of the cheeks during mastication (chewing) N: facial nerve – buccal branches
107