面部肌肉與表情 Part 3 - 眼眶和鼻組

探討東西方哲學 理解宇宙的神祕奧祕 Origin nasal part of frontal bone Frontal process of maxilla Medial palpable ligament Insertion fibers form an uninterrupted ellipse around orbit Function closes the eyelids forcefully Lacrimal part lies behind the lacrimal sac It arises from posterior lacrimal crest and lacrimal fascia Forming a sheath of lacrimal sac that passes laterally In front of tarsal plates of both eyelids To be inserted into the lateral palpable raphe Action It dilates the lacrimal sac by exerting traction on the lacrimal fascia Thus helping in the drainage of lacrimal fluid Crow's feet The contraction of entire orbicularis oculi Draws the skin of forehead, temple And cheek towards the lateral angle of the eye Producing radiating skin folds from the lateral angle of the eye Which may be a permanent feature in some old people Forming the so-called crow's feet Corrugator supercili Origin Medial end of the superciliary arch Insertion skin of the medial half of eyebrow Function Draws the eyebrows medially and downward Producing vertical wrinkles on the forehead As in frowning, an expression of annoyance Other muscles Frontalis It is already explained in the section on scalp The frontalis elevates the eyebrows And produces transverse wrinkles on the forehead As an expression of surprise, horror or fright Innervated by temporal branch of facial nerve Occipital belly Innervated by posterior auricular branch of facial nerve Levator palpebrae superioris It is not a muscle of the face But one of the orbital muscles It is innervated by oculomotor nerve Hence described under orbit Levator palpebrae superioris Is an antagonist to the sphincteric action Of palpable part of orbicularis oculi It elevates the upper eyelid Nasal group Nasalis Transverse part, compressor naris Arises from maxilla just lateral to nose Across the bridge of nose Where it becomes continuous with its counterpart On the opposite side Insertion Epineurosis across dorsum of nose With the muscle fibers from the other side Action Compresses nasal aperture Allar part or dilator naris Arises from the maxilla From the margin of the nasal notch And is inserted into the lateral part Of the alla of the nose It dilates the anterior nasal aperture As in deep inspiration It also expresses the anger Proserous It arises from nasal bone Passes upward to be inserted into the skin Of the lower part of the forehead It produces transverse wrinkles Across the bridge Or root of the nose As in frowning Depressor septi It arises from the incisive fossa of the maxilla And is inserted into the lower mobile part Of the nasal septum It pulls the nose inferiorly And it fixes the nasal septum To allow dilatation of anterior nasal aperture By dilator naris