Unit 03 Flashcards - Muscles of the face, head, and neck:...

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Muscles of the face, head, and neck: Occipitofrontalis: Frontalis and Occipitalis
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Location: Composite muscle that overlies the cranium; the two muscles are connected by an aponeurosis Action: Frontalis: Raises the eyebrows Occipitalis: Draws scalp posteriorly
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Muscles of the face, head, and neck: Orbicularis oris
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Location: Circular muscle that encircles the mouth. Action: Puckers the mouth as in kissing.
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Muscles of the face, head, and neck: Orbicularis oculi
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Location: Circular muscle that encircles each eye. Action: Closes each eye as in blinking
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Muscles of the face, head, and neck: Zygomaticus major
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Location: Originates on the zygomatic bone and inserts on the skin at the corners of the mouth. Action: Pulls the corners of the mouth superiorly as in smiling.
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Muscles of the face, head, and neck: Platysma
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Location: Originates on the fascia of the chest and deltoid and inserts on the mandible and skin below the mouth. Action: Depresses the lower lip and mandible; tenses neck skin.
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Muscles of the face, head, and neck: Temporalis
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Location: Originates on the temporal bone and inserts on the mandible. Action: Elevates and retracts the mandible.
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Muscles of the face, head, and neck: Masseter
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Location: Originates on the maxillae and zygomatic bones and inserts on the mandible. Action: Elevates and protracts the mandible.
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Muscles of the face, head, and neck: Sternocleidomastoid
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Location: Originates on the sternum and clavicle and inserts on the mastoid process of the temporal bone. Action: If one side contracts, the head rotates to the opposite side. If both contract, flexion of the head is the result.
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Muscles that move the vertebral column: Rectus abdominis
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Location: Originates on the pubis and inserts superiorly on the lower ribs and xiphoid process. Action: Flexes the vertebral column and compresses the abdomen.
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Muscles that move the vertebral column: External oblique
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Location: Originates laterally on the lower ribs and inserts medially on the iliac crest and linea alba. Action: Rotation of the trunk results if one side contracts. If both sides contract together, flexion of the vertebral column and compression of the abdomen is the result.
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Muscles that move the vertebral column: Internal oblique
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Location: Located deep to the external oblique, the internal oblique originates laterally at the iliac crests and inserts medially at the linea alba and lower ribs. Action: The internal oblique has the same action as the external oblique.
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Muscles that move the vertebral column: Transverse abdominis
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Located deep to the internal oblique, the transverse abdominis originates laterally on the iliac crest and the cartilages of the lower ribs. It inserts medially at the xiphoid process and linea alba. Action:
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Unit 03 Flashcards - Muscles of the face, head, and neck:...

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