111 Ch. 30

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eternity2130
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111 Ch. 30
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2012-10-16 10:12:18
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Den 111 Ch. 30
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  1. Facial expression
    all the muscles innervated by the 7th cranial nerve (facial nerve)
  2. Ears 
    • 1) The muscles are more developed in animals then humans.
    • 2) Posterior auricular muscle
    • * Pulls the ear back. Probably the best developed ear muscle.
    • 3) Superior auricular muscle
    • * Raises the ear.
    • 4) Anterior auricular muscle
    • * Pulls ear slightly forward.
  3. Scalp 
    • 1) Muscle- Occipitofrontalis (epicranius) is a paired muscle.
    • 2) Forward movement causes a frown look.
    • 3) Backward movement causes a surprise look.
  4. Neck 
    • 1) Muscle- Platysma muscle.
    • 2) There is some disagreement about its origin and insertion.
    • 3) Inferior border of the mandible to just below the clavicle.
  5. Eyes 
    • Has 3 muscles.
    • 1) Orbicularis Oculi muscle (has 2 parts) (Closes the eyelids)
    • * Palpebral part (top) Eyelid.
    • * Orbital part (bottom).
    • 2) Corrugators muscle (bridge of the nose to lateral part of the eyebrow)
    • * Pulls eyebrow medially and down. Ex. Frown
    • 3) Procerus muscle (bridge of the nose to medial end of the eyebrow)
    • * Pulls eyebrow at medial end down. Ex. Frown or Squint
  6. Nose 
    • Has 2 muscles.
    • 1) Dilator Naris
    • * Pulls down on nostrils. Ex. Flare and Dilate
    • 2) Compressor Naris
    • * Causes nostrils to close or compress.
  7. Mouth
    • 1) Influences:
    • * Expression
    • * Speech
    • * Aids in mastication
    • 2) Abnormal pressure causes:
    • * Cheek biting
    • * Lip biting
    • * Lip compression (can cause teeth misalignment)
  8. Muscle of the Mouth (10)
    • 1) Orbicularis Oris
    • * Circles the oral cavity in the tissue of the lip.
    • * Causes �closes and compresses lip�.
    • 2) Levator Labii Superioris
    • * Elevates the upper lip.
    • * Origin is just beneath the lower rim of the orbit.
    • * Insert into the Orbicularis oris.
    • 3) Zygomaticus Minor
    • * Elevates upper lip.
    • * Poorly developed muscle.
    • * From the Zygomatic bone to the Orbicularis oris.
    • 4) Zygomaticus Major
    • * It is larger then the zygomatius minor.
    • * Elevates the corner of the mouth as in a smile.
    • * From the Zygomatic bone to the Orbicularis oris5)
    • 5) Levator Anguli 
    • * Pulls the angles of the mouth up and toward the midline.
    • * From the maxilla(below the infra orbital foramen) to the Orbicularis oris.
    • * Lies deep to the levator labii superioris and the zygomaticus major and minor.
    • 6) Depressor Labii Inferioris
    • * Pulls lower lip down as in a pout.
    • * From beneath the angles of the mouth to just below the inferior boarder of the mandible.
    • 7) Depressor Anguli Oris
    • * Pulls the corners of the mouth down.
    • * The muscle fibers appear to be a continuation of the fibers of the Platysma.
    • 8) Mentalis
    • * Pulls skin of chin up
    • .9) Buccinator
    • * Probably the most important muscle of the mouth.
    • * Involved in: 1) Facial expression 2) Mastication
    • * When the muscle contracts, it pulls the corners of the mouth back and compresses the cheeks.
    • * During chewing, the food is crushed and grounded between the molars.
    • * Also referred to the accessory muscle of mastication.
    • * Fibers run anteriorly.
    • * Person with a stroke or Bell's palsy would have difficultly chewing, food would pile up in the buccal vestibule.
    • 10) Risorius
    • * Aids in smiling, but poorly developed.
    • * Is a small muscle.
    • * Inserts into the corner of the mouth.
    • * Is an apparent continuation of the posterior fibers of the Platysma muscle.

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