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Hearing Science 4
Final Exam
| Question | Answer |
|---|---|
| What does the inner ear consist of? | The inner ear can be divided into 3 sections- vestibule, cochlea, and semicircular canals Also consists of 2 labyrinthine systems- osseous and membranous |
| Osseous Labyrinth | -A system of canals and cavities in the petrous portion of the temporal bone -vestibule forms the central portion -semicircular canals lie posterior to the vestibule -cochlea lies anterior and slightly inferior to vestibule |
| Vestibule | Houses 2 structures concerned with balance: utricle and saccule *Both of these structures contain sensory epithelia that are responsive for linear acceleration and effects of gravity |
| Semicircular Canal | There are 3 semicircular canals- superior, posterior, and anterior -Semicircular canals open into vestibule via 5 openings called ampula(e) - ampullae contain sensory receptors for rotational acceleration |
| Cochlea | -Medial portion of bony labyrinth -Cochlea is where auditory portion of the ear is housed -Snail coiled canal (2 3/4 turns) -Cochlea is twisted around a central core pillar of bone called the modiolous |
| Cochlea | -Divided into upper and lower ducts (upper-scala vestibule and lower-scala tympani) -the s. vestibule and s. tympani are completely separated except near the apex where a tiny opening called the helicotrema permits communication between the two |
| Cochlear Duct | -attaches to the outer wall of the cochlea via the spiral ligament -superiorly the cochlear duct is seperated from the s. vestibule by Reissner's membrane (vestibular membrane) which extends from the osseous spiral lamina to outer wall of cochlea |
| Cochlear Duct | Inferiorly, the cochlear duct is separated from the s. tympani by the basilar membrane which extends from the spiral lamina to the spiral ligament on the s. tympani side |
| Basilar Membrane (Cochlear Duct) | -Basilar membrane is narrower and stiffer at base, broader at apex and has 2 parts: 1. one part is thin and extends from spiral lamina to outer pillars (zona arcuta) 2. one part is thicker and extends to the spiral ligament (zona pectinata) |
| Membranous Labyrinth | -contained within the osseous labyrinth and resembles its shape -filled with endolymph -membranous labyrinth is found in the 3 semicircular canals, vestibule, cochlea, and cochlear duct |
| Osseous Spiral Lamina |
Created by:
jachorn
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