3 (number)
Please post your comments and suggestions for this article.
Comment by michael mullins on April 25th, 2009 at 6:24 am
very nice
Comment by Herb O. Buckland on June 22nd, 2010 at 12:45 pm
Here are a few other “three” instances for your anatomy section with respect to the ear:
3 overall divisions:
Outer – Inner – Middle
3 middle ear divisions:
Tympanum – Epitympanum – Mastoid antrum
3 eardrum membranes:
Cutaneum – Collagen fibers – Mucosm
3 semi-circular canals
3 bones (ossicular chain):
Incus- Stapes -Malleus
3 main malleus ligaments:
Anterior- Lateral -Superior
3 incus anchorage points:
Malleus – Stapes – Bony fossa wall
3 cochlea sections (Scala):
Vestibuli- Tympani -Cochlear duct
3 extrinsic muscles (Auricularis):
Anterior- Superior – Posterior
3 sound conduction paths:
Elec. – Mech. – Fluid
Bone (solid) – Air (gas) – Fluid (liquid)
3 nerve stimulation paths:
Mech.- Chem. – Elect.
3 outer hair cell rows (typical in mammals)
3 main forms of ossicular chain fixation: Fluid – Mechanical -Otosclerosis
3 classes of ossicular lever action: Force arm – Resistance arm – Fulcrum
3 principal types of deafness: Conduction – Nerve – Stimulation
3 acoustic distortion forms: Frequency – Phase – Amplitude
3 basic properties of vibrating bodies: Inertia – Elasticity – Dissipation
3 sound characteristics: Pitch – Volume (intensity) – Tone
3 Sound wave propagation processes: Diffraction – Transmission – Reflection
3 turns to the Cochlea, variously mismeasured as 2 3/8, 2¼, 2 5/8, 2½, 2¾, 2 7/8, etc., ???
Thank you.
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