Subject: Re: A question on B=?ISO-8859-1?Q?=E9k=E9sy.?= From: David Mountain <dcm@xxxxxxxx> Date: Fri, 19 Mar 2010 12:00:23 -0400 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>--00151747be62f1efb604822971ac Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable 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 B=E9k=E9sy (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" =3D 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 . > --=20 David C. Mountain, Ph.D. Professor of Biomedical Engineering Boston University 44 Cummington St. Boston, MA 02215 Email: dcm@xxxxxxxx Website: http://www.bu.edu/hrc/research/laboratories/auditory-biophysics/ Phone: (617) 353-4343 FAX: (617) 353-6766 Office: ERB 413 --00151747be62f1efb604822971ac Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable The viscosity of endolymph is similar to water.=A0 The "gelatinous mas= s" is probably the agar/gelatin mixture mention earlier on the same page.<br><= br><div class=3D"gmail_quote">On Fri, Mar 19, 2010 at 9:20 AM, <a href=3D"m= ailto:reinifrosch@xxxxxxxx">reinifrosch@xxxxxxxx</a> <span dir=3D"ltr">= <<a href=3D"mailto:reinifrosch@xxxxxxxx">reinifrosch@xxxxxxxx</a>>= ;</span> wrote:<br> <blockquote class=3D"gmail_quote" style=3D"border-left: 1px solid rgb(204, = 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Dear colleagues,<= br> <br> At the bottom of page 475 of his book "Experiments in Hearing",<b= r> McGraw-Hill, New York, von B=E9k=E9sy (1960) has written:<br> <br> "[...] It was further established that the gelatinous mass in the<br> cochlear duct increased the rigidity of the partition, especially<br> near the helicotrema. [...]"<br> <br> What is that "gelatinous mass"? I seem to remember that<br> the viscosity of endolymph is about equal to that of water.<br> <br> A wild guess: "gelatinous mass" =3D tectorial membrane (??)<br> <br> Your (on- or off-line) suggestions would be very welcome,<br> of course, even if you are not absolutely sure !<br> <br> Reinhart.<br> <br> Reinhart Frosch,<br> Dr. phil. nat.,<br> r. PSI and ETH Zurich,<br> Sommerhaldenstr. 5B,<br> CH-5200 Brugg.<br> Phone: 0041 56 441 77 72.<br> Mobile: 0041 79 754 30 32.<br> E-mail: <a href=3D"mailto:reinifrosch@xxxxxxxx">reinifrosch@xxxxxxxx</a= > .<br> </blockquote></div><br><br clear=3D"all"><br>-- <br><br>David C. Mountain, = Ph.D.<br>Professor of Biomedical Engineering<br><br>Boston University<br>44= Cummington St.<br>Boston, MA 02215<br><br>Email: =A0 <a href=3D"mailto:dcm= @xxxxxxxx">dcm@xxxxxxxx</a><br> Website: <a href=3D"http://www.bu.edu/hrc/research/laboratories/auditory-bi= ophysics/">http://www.bu.edu/hrc/research/laboratories/auditory-biophysics/= </a><br>Phone: =A0 (617) 353-4343<br>FAX: =A0 =A0 (617) 353-6766<br>Office:= =A0ERB 413<br> <br> --00151747be62f1efb604822971ac--