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Bio125 Lab Exam 2: Sense Organs (terms only)

  1. The ear is divided into three major areas
    • outer ear
    • middle ear
    • inner ear
  2. outer ear
    functions in hearing
  3. middle ear
    functions in hearing
  4. inner ear
    functions in both hearing and equilibrium
  5. external ear is composed of (3)
    • article (pinna)
    • external acoustic meatus
    • tympanic membrane
  6. the auricle (pinna) is
    the skin-covered cartilaginous structure encircling the auditory canal opening
  7. auricle (pinna) function
    collects and directs sound wave into the external acoustic meatus/canal
  8. external acoustic meatus (external auditory canal) is
    • a short, narrow chamber carved into the temporal bone
    • -lined with skin and contains hairs, sebaceous glands, and ceruminous glands (secretes wax)
  9. external acoustic meatus (external auditory canal) function
    transmits soundwaves from the auricle to the tympatic membrane
  10. tympatic membrane (eardrum) vibrates at
    exactly the same frequency as the sound wave(s) hitting it
  11. the eardrum separates the
    outer from the middle ear
  12. tympanic membrane
    a small air-filled chamber found within the temporal lobe
  13. the tympanic membrane is spanned by three small bones, collectively called
    the ossicles
  14. the ossicles contains (3)
    • malleus
    • incus
    • stapes
  15. the ossicles articulate to form ...
    a lever system that amplifies and transmits the vibratory motion of the eardrum to the fluids of the inner ear via the oval window
  16. oval window is deep to
    stapes
  17. the ear ossicles are the _____ bones in the body
    smallest
  18. malleus (shapes like hammer)
    attaches to the eardrum
  19. incus (shaped like anvil)
    between the malleus and stapes
  20. stapes (shaped like stirrup)
    vibrates against the oval window
  21. pharyngotympanic tube (auditory tube) connects
    • the middle ear chamber with the pharynx
    • function: equalizes the air pressure within your middle ear
  22. the inner ear is a bony labyrinth consisting of three parts:
    • semicircular canals
    • vestibule
    • cochlea
  23. the vestibule and semicircular canals are involved with
    equilibrium
  24. the snail-like _____ contains the sensory receptors for hearing
    cochlea
  25. the cochlear ducts lies between two chambers (scale vestibuli and scala tympani) and contains receptors for
    hearing
  26. the vestibular membrane
    the roof of the cochlear duct
  27. basilar membrane
    the floor of the cochlear duct
Author
jocelyn8
ID
361351
Card Set
Bio125 Lab Exam 2: Sense Organs (terms only)
Description
Updated

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