Bits & Pieces Flashcards

1
Q

What seperates the ethmoid air cells from the orbit?

A

Lamina Papyracea or Orbital Lamina

Its the lateral bony plate of the ethmoid bone seperating the air cells from the orbit

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2
Q

Which part of the facial nerve innervates bilaterally?

A

The part to the forehead

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3
Q

Describe the arrangement of nerves in the IAM?

A

Split into 4 quadrants:

  • Post-Inf = Inferior Vestibular
  • Post-Sup = Superior Vestibular
  • Ant-Inf = Cochlear
  • Ant- Sup = Facial

(7up Coke Down = VII nerve superior and Cochlear nerve inf)

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4
Q

Describe the structure of the cochlea:

A

Scala Tympani (Tympanic Duct) runs around the Scala Media (cochlear Duct) which contains the Organ of corti on which the hair cells are found.

ST = Perilymph
SC = Endolymph
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5
Q

Describe the semi-circular Canals:

A

Three:

  • Sup/Ant (Vertical in the Sagittal Plane so nodding/tipping head)
  • Post (Coronal Plane)
  • Lateral (Transverse plane so does turning of head)

These orientations are not very precise

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6
Q

Which end of the cochlea is high frequency sound detected at?

A

Basal turn i.e. closer to the Oval window.

So does that mean low Frequency sounds travel further round?

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