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17 Cards in this Set
- Front
- Back
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front belly of the occipital frontalis Origin: epicranial aponeurosis Insertion: skin and subcutaneous tissue of eyebrows and forehead Action: elevates eyebrows and wrinkles forehead; protracts scalp |
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Occipital belly of occipitofrontalis: opposes the frontal belly to achieve the same facial expression Origin: lateral two-thirds of the superior nuchal line of the occipital bone Insertion: epicranial aponeurosis Action: retracts scalp |
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Orbicularis occuli Origin: medial orbital margin; medial palpebral ligament; lacrimal bone Insertion: skin around the orbital margin; superior and inferior tarsal plates Action: closes eyelids |
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The two parts of orbicularis occuli perform qualitatively different actions. what are they? |
Palpebral part: gently closes the eyelids; involuntary (e.g., reflex blinking) Orbital part: tightly closes the eyelids; voluntary (e.g., winking) |
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Corrugator supercilii Origin: Supraorbital ridge (superciliary arch) of the frontal bone Insertion: Skin superior to supraorbital ridge Action: Draws eyebrows medially and inferiorly, creating wrinkles above the nose, conveying concern or worry |
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Procerus Origin: Fascia covering the lower part of the nasal bone and the upper part of the nasal cartilage Insertion: Skin of inferior forehead, between the eyebrows Action: Depresses medial end of eyebrows; wrinkles skin over nose (Conveying disdain or dislike) |
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Transverse part of naisalis Origin: Maxilla, lateral Insertion: Fascia covering the lower part of the nasal bone and the upper part of the nasal cartilage (i.e., with the aponeurosis of procerus) Action: Depresses medial end of eyebrows; wrinkles skin over nose (Conveying disdain or dislike) |
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Alar part (dilator nasalis) Origin: Maxilla, medial Insertion: Greater alar cartilage Action: Flaring of the nostrils |
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Orbicularis oris Origin: Medial maxilla and mandible; deep surface of the peri-oral skin; angle of the mouth Insertion: Mucous membrane of the lips Action: Compresses and protrudes lips (kissing); or resists distension (when blowing) |
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Buccinator Origin: Alveolar processes of maxilla and mandible of the molars Insertion: Angle of mouth; orbicularis oris Action: Presses cheek against moral teeth; resists distension when blowing |
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Levator anguli oris Origin: Infra-orbital maxilla Insertion: Angle of mouth Action: Widens oral fissure (grinning or grimacing) |
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Depressor anguli oris Origin: Anterolateral base of mandible Insertion: Angle of mouth Action: Depresses labial commissures bilaterally to frown (sadness) |
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Zygomaticus major Origin: Lateral aspect of zygomatic bone Insertion: Angle of mouth Action: Elevates labial commissure; bilaterally to smile, unilaterally to sneer (Elvis lip) |
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Levator labii superioris Origin: Infra-orbital margin of the maxilla Insertion: Skin of upper lip Action: Elevates the upper lip (typically in combination with the activity of other muscles to produce expression) |
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Zygomaticus minor Origin: Anterior aspect of zygomatic bone Insertion: Skin of upper lip Action: Elevates the upper lip (typically in combination with the activity of other muscles to produce expression) |
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Mentalis Origin: Body of the mandible Insertion: Skin of chin Action: Elevates and protrudes lower lip; wrinkling chin skin (showing doubt or displeasure; the pouting muscle) |
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Platysma: Origin: Subcutaneous tissue, infraclavicular and supraclavicular regions Insertion: Base of mandible; skin of cheek and lower lip; angle of mouth; orbicularis oris Action: elevates eyebrows and wrinkles forehead; protracts scalp |
