2.  Collects sound waves, channels them into ear canal  Rich in cartilage  Continues to grow throughout life!

3.  Trauma/Bruising leads to…  accumulation of blood, tissue  Builds up between skin, cartilage

4.  Small nodules filled with crystals of uric acid  Common in patients with gout

5.  Nodule at the helix  Congenital (inherited)

6.  Divides external and middle ear  Vibrations of air cause this membrane to vibrate, like a drum  Diagnostic information  Redness, inflammation, Bulging = infection

7. Vestibulocochlear nerve (VIII) Eustachian tube

8.  Leads from auricle/pinna to tympanic membrane/eardrum  Collects sound waves  Outer 1/3 contains:  Many short hairs  Ceruminous glands – produce wax (cerumen) ▪ Collects debris ▪ May accumulate, absorb/block sound waves

10.  Hollowed area of temporal bone (labrynth)  Houses three very small bones (ossicles)  Malleus (hammer)  Incus (anvil)  Stapes (stirrup)  Transmits sound from tympanic membrane to oval window  Eustachian (auditory) tube – connects throat with middle ear – equalizes pressure

11.  Blocked/inflamed Eustachian tube due to infection  Can’t equalize pressure  discomfort

13.  Complex spaces in the temporal bone, called bony labyrinth  Filled with watery perilymph  Divided into: ▪ Vestibule ▪ Semicircular canals ▪ Cochlea

14.  “Tube-in-a-tube”  Membranous labyrinth  Filled with thicker endolymph

15.  3 half-circle canals  Oriented at right angles to each other  Contain ampulla  Contains crista ampullaris ▪ Hairlike extensions suspended in endolymph  Generates nerve impulse when head moves