Lecture 25 - Muscle gross anatomy I Muscles of the face...

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Muscle gross anatomy I
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Muscles of the face Occipitofrontalis (Epicranius) = Frontalis + Occipitalis Occipitalis Frontalis Galea aponeurotica (epicranial aponeurosis) Actions: Frontalis – raises eyebrows and wrinkles forehead Occipitalis – draws scalp posteriorly
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Muscles of the face Orbicularis oculi Orbicularis oris Platysma Zygomaticus major Actions: Orbicularis oculi – closes the eye as in blinking Orbicularis oris – puckers the mouth for speech, “kissing” muscle Platysma – moves the lower lip inferiorly and posteriorly, depresses mandible Zygomaticus major – pulls the corners of the mouth superiorly, “smiling” muscle
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Muscles that move the mandible Temporalis Masseter Actions: Temporalis – elevates and retracts the mandible Masseter – elevates and protracts the mandible
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Muscles that move the tongue Genioglossus Hyoglossus Geniohyoid Hyoid bone Actions: Genioglosus, hyoglosus, geniohyoid – protrude the tongue and hyoid bone and depress the tongue in the mouth Glossa = tongue
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Muscles that move the head Sternocleidomastoid Actions of sternocleidomastoid: When both contract – flexion of the head When one side contracts – rotation of head to opposite side; lateral flexion of the head
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Respiratory muscles Diaphragm Internal intercostals External intercostals
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Lecture 25 - Muscle gross anatomy I Muscles of the face...

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