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outer ear
hearing science
| Question | Answer |
|---|---|
| Anatomy | structure |
| physiology | function |
| temporal lobe | contains the sensory oragns and protects the organs of hearing and balance |
| process of hearing (transduction) | begins with acoustic energy from the outer ear to mechanical energy in the middle ear and fluid energy in the inner ear and is finished by electrical energy |
| components of the outer ear | auricle(pinna) ear canal (external auditory meastus) and the tympanic membrane (outer layers of the ear drum) |
| auricle (pinna) | skin covered cartilage. has three parts the helix which is the upper rim. the lobule which is the flabby part at the end and the concha which is bowl at the entrance of the ear canal. |
| ear canal (external auditory meatus) | measure 23-29mm. its on a downward bend and produces wax. the junction btwn the cartilagineous portion and the bony porton is called the oseocartilgineous junction) |
| tympanic membrane (outer layers of the ear drum) | made of several layers of skin. concave and slightly inward) separates the external ear from the middle ear. it function in transmitting sound from the air to the ossicles inside the middle ear. |
| otoscope | instrument that measures the eardrum |
| umbo | centerpoint of the ear drum where the malleaus attaches the tympanic membrane |
| function of the outer ear | collects and resonates souns ( resonantes gives gain of ~20dB at 3000Hz. assists in acoustic sound localization and protects the middle ear by cerumen (wax) |
| resonants frequency of ear canal, pinna, and concha | ~2700Hz, ~5000Hz for both |
| total enhancement of the resonants frequencies of the ear canal and pinna | ~20dB at 3000Hz |
| why are audiologist concerned with the pinna function | imp in dispensing hearing aids bc they change the resonance of the pinna. you lose resonance of concha and therefore dont get alot of resonance. |
| how does the outer ear assist in sound lozalization | the head related transfer function desccribe show a sounf is filtered by the diffraction and reflection porperties of the head pinna and torso before the sound reaches the eardrum. depending on the position of the head pinna and torso you will now where t |
| describe the process of sound localization | measures the outer ear the differennce in time and intensity. |
| what is cerumen? where does it come from? | cerumen is wax and it comes from the ceruminous glands that secretes it protects the skin from foreign objects entering the ear canal. |
| what does the sebaceous glands do? | the sebaceous gland in ear canal secretes the oily substance (sebum) it also protects the skin and prevents objects from enetring the ear canal. |
| Oseocartilagenous | junction between the cartilginaous portion and the bony portion in the ear canal (external auditory meatus) |
Created by:
GHAIDEE