Re: A question on B=?UTF-8?Q?=C3=A9k=C3=A9sy.?= ("reinifrosch@xxxxxxxx" )


Subject: Re: A question on B=?UTF-8?Q?=C3=A9k=C3=A9sy.?=
From:    "reinifrosch@xxxxxxxx"  <reinifrosch@xxxxxxxx>
Date:    Fri, 19 Mar 2010 17:58:07 +0000
List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>

Thank you, Harriet and David -- but I have two different answers now ! Harriet: could you please give details on why you think that the "gelatinous mass" is the TM? As you know, that verdict is hard to swallow; von Bekesy knew the TM well. David: fairly ingenious! Agar and gelatin are even mentioned twice on that page 475. The helicotrema was closed with such a mixture, and after conclusion of the measurements at the apex, the scala tympani was closed again with agar and gelatin. With "cochlear lumen", Bekesy means "cochlear channel", I believe. But I do not understand that page 475 completely. Can that gelatin get into the cochlear duct ? It would be nice if we could now clear up this gelatinous problem. I asked the List about it a few years ago already, I believe, but did not get answers then. The problem is important to me in connection with Bekesy's Fig. 11-73 (BM stiffness). Reinhart. ----Ursprüngliche Nachricht---- Von: dcm@xxxxxxxx Datum: 19.03.2010 17:00 An: <reinifrosch@xxxxxxxx> Kopie: <AUDITORY@xxxxxxxx> Betreff: Re: A question on Békésy. The viscosity of endolymph is similar to water. The "gelatinous mass" is probably the agar/gelatin mixture mention earlier on the same page. On Fri, Mar 19, 2010 at 9:20 AM, reinifrosch@xxxxxxxx < reinifrosch@xxxxxxxx> wrote: > Dear colleagues, > > At the bottom of page 475 of his book "Experiments in Hearing", > McGraw-Hill, New York, von Békésy (1960) has written: > > "[...] It was further established that the gelatinous mass in the > cochlear duct increased the rigidity of the partition, especially > near the helicotrema. [...]" > > What is that "gelatinous mass"? I seem to remember that > the viscosity of endolymph is about equal to that of water. > > A wild guess: "gelatinous mass" = tectorial membrane (??) > > Your (on- or off-line) suggestions would be very welcome, > of course, even if you are not absolutely sure ! > > Reinhart. > > Reinhart Frosch, > Dr. phil. nat., > r. PSI and ETH Zurich, > Sommerhaldenstr. 5B, > CH-5200 Brugg. > Phone: 0041 56 441 77 72. > Mobile: 0041 79 754 30 32. > E-mail: reinifrosch@xxxxxxxx .


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