Muscles of facial expression

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1. what is ectropion?

  • when the lower lid droops this results in lacrimal fluid builds up and not spread accross the surface. so debris builds up and causes ulceration of cornea.
  • when the upper lid droops this results in lacrimal fluid builds up and not spread accross the surface. so debris builds up and causes ulceration of cornea.
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2. Where are the facial muscle located? What are they innervated by?

  • in deep cutaneous tissue by cranial nerve
  • in subcutaneous tissue, by facial nerve
  • in thoracolumbal fascia by facial nerve

3. Where does procerus orginate from

  • Its is the most superior muscle in the nasal muscles and attaches onto the skin above zygomatic bone
  • it orginates from the nasal bone and inserts onto the lower medial forehead -pulls eyebrows medially cause vertical wrinkles
  • it orginates from the nasal bone and inserts onto the upper forehead -raises eyebrows medially cause horizontally wrinkles

4. Insertion, function of the largest muscle in the nasal group.

  • Deppresor septi nasi, inserts= transverse part to the aponeurosis at the dorsum of the nose (compreses flares). Alar part to the alar cartilage of nasoskeleton (inflares nostrils)
  • Nasalis, inserts= transverse part to the aponeurosis at the dorsum of the nose (compreses flares). Alar part to the alar cartilage of nasoskeleton (inflares nostrils)
  • Nasalis, inserts= into the maxilla (inflares nostrils)

5. Which of these muscles are not part of the orbital group?

  • Obcularis Oculi - inner palpebral part
  • Procerus (eyebrows)
  • Obcularis Oculi - outer orbital part
  • Corrugator Supercilli

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