Middle Ear Anatomy - Key Structures

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Across
  1. 3. Located on the anterior wall, this is one of two main arteries that supplies blood to the brain
  2. 5. This chain of bones comprised the three smallest bones in the body which are all attached to each other but not directly attached to any other bones in the body.
  3. 7. This cranial nerve, which innervates the tensor tympani muscle can be found in a canal on the medial wall of the tympanic cavity.
  4. 11. A prominence of this canal protrudes from the medial wall of the tympanic cavity. This canal is also involved with maintaining orientation and balance.
  5. 15. This structure encases the stapedius muscle and is located on the posterior wall of the tympanic cavity
  6. 17. Located in the superior part of the tympanic cavity this space houses the head of the malleus and incus
  7. 18. An opening on the medial wall of the tympanic cavity where the stapes attaches
  8. 19. An opening on the medial wall of the tympanic cavity
Down
  1. 1. Located on the medial wall of the tympanic cavity, this is the name for the base of the cochlea that projects into the tympanic cavity
  2. 2. The most inferior part of the tympanic cavity
  3. 4. This muscle is innervated by Cranial Nerve VII; originates in the pyramidal eminence and inserts on the neck of the stapes bone, near posterior crus. The role of this muscle it to pull the ossicular chain posteriorly.
  4. 6. This muscle is innervated by Cranial Nerve V; originates on the anterior wall of the middle ear and inserts on the malleus bone. The role of this muscle is to pull the ossicular chain anteriorly.
  5. 8. An anvil shaped bone that has a lenticular process that articulates with the stapes bone in a ball and socket joint
  6. 9. A hammer shaped bone that has the manubrium of the bone embedded into the tympanic membrane
  7. 10. The middle part of the tympanic cavity
  8. 12. The channel that connects the middle ear to the nasopharynx. The superior 1/3 of the channel is encased in bone and the inferior 2/3 is encased in cartilage. The function is to equalize pressure on both sides of the tympanic membrane.
  9. 13. A concave shaped, thin, translucent and highly elastic membrane that separates the inner ear from the middle ear or tympanic cavity
  10. 14. A stirrup shaped bone whose footplate attaches to the oval window
  11. 16. Located on the posterior wall of the tympanic cavity, this is an opening or narrow bony passageway that connects the tympanum to the antrum (a small chamber with air cells in the mastoid portion of the temporal bone).