Editing 20110105 Lecture 4 notes.txt
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===Hearing=== | ===Hearing=== | ||
*The cochlea is important for sound sensing. | *The cochlea is important for sound sensing. | ||
- | * | + | *Our low is 20 kHz and high is 200 hz. |
- | + | **The cochlea is importnat for low and the helic? is for high. | |
- | **The | + | *There is a narrow membrane at the base but narrow at the apex (helic?). |
- | *There is a narrow membrane at the base but narrow at the apex ( | + | What? Something about the two membranes being opposite... |
- | + | *Place coding is the specific area of th emembrane that vibrates given the frequency of a sound wave. | |
- | *Place coding is the specific area of | + | |
*There are three important parts: | *There are three important parts: | ||
- | **The | + | **The scalar media contains endolymnph which is rich in K+ (125 miliMolar). This causes a very high positive potential inside because marginal cells move K+ into that area. |
**The high levels of K+ make the potential positive for cells in scalar media. | **The high levels of K+ make the potential positive for cells in scalar media. | ||
- | **Didn't talk about other two areas | + | **Didn't talk about other two areas. |
===Organ of corti=== | ===Organ of corti=== |