Ear IB 131
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29 terms
Terms | Definitions |
|---|---|
 The ear is composed of three main regions: What are they? | - Outer ear—functions in hearing - Middle ear—functions in hearing - Internal ear—functions in both hearing and equilibrium |
| Which region of the ear functions in both hearing and equilibrium? | Internal ear |
| The Outer (External) Ear is composed of what? And it helps what? | Auricle (pinna) Helps direct sounds |
| What forms the boundary between the external and middle ear? | Tympanic membrane |
| The Middle Ear is composed of? Where is it located? | Tympanic cavity Within the petrous portion of the temporal bone |
| What links the middle ear and pharynx? | Pharyngotympanic tube (auditory or eustachian tube) |
| In the Middle Ear, what is smallest bones in the body? | Ear ossicles |
| What attaches to the eardrum? | Malleus |
| What are the tensor tympani and stapedius? | Two tiny skeletal muscles in the middle ear cavity |
| What is the Internal ear also called? | the labyrinth |
| Where does the Internal ear lies in? | Lies within the petrous portion of the temporal bone |
| What is a cavity consisting of three parts: - Semicircular canals - Vestibule - Cochlea | a Bony labyrinth |
| What is series of membrane-walled sacs and ducts consist consisting of three main parts: • Semicircular ducts • Utricle and saccule • Cochlear duct | Membranous labyrinth |
| What is Membranous labyrinth filled with? | a clear fluid—endolymph |
| Bony labyrinth is filled with? | perilymph |
| What is perilymph? | continuous with cerebrospinal fluid |
| Semicircular canals (bony labyrinth) contain what? | semicircular ducts (membranous labyrinth) |
| What is semicircular ducts (membranous labyrinth)? | facilitates equilibrium related to rotational acceleration of the head |
| Vestibule (bony labyrinth) contain what? | utricle and saccule (membranous labyrinth) |
| What is utricle and saccule (membranous labyrinth)? | facilitates equilibrium related to static equilibrium and linear acceleration of the head |
| Cochlea (bony labyrinth) contain what? | cochlear duct (membranous labyrinth) |
| What is cochlear duct (membranous labyrinth)? | facilitates hearing |
| The cochlear duct (scala media) contains what? | receptors for hearing |
| What is Spiral organ (of Corti)? | receptor epithelium for hearing |
| Inner hair cells are what? | receptors that transmit vibrations of the basilar membrane |
| Outer hair cells actively tune what? Amplify what? | cochlea the signal |
| What are two disorders of Deafness? | Conduction deafness and Sensorineural deafness |
| What is Conduction deafness? | Sound vibrations cannot be conducted to the inner ear - Ruptured tympanic membrane, otitis media, otosclerosis |
| What is Sensorineural deafness? | Results from damage to any part of the auditory pathway |
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