Dear Randy:
Your description of the function of the each muscle group is exactly
my understanding of their function. Would you care to comment on the
confusion that often exists when one set of muscles is given credit
for isolated control.?
For example, is it possible for the cricothyroids to cause
longitudinal tension without the assistance of the resistance of the
thyroarytenoids, especially in mid range singing when the vocal
ligament is not yet stretched to its tension potential?
Do the cricothyroids have some function in resisting the
thyroarytenoids in chest voice?
Do the medial compression muscles (the lateral cricoarytenoids and
the interarytenoids) also assist in a small manner with maintaining
the longitudinal tension on the vocal folds even though their primary
function is to close the vocal folds?
Although I do not have my copy of Zemlin here at the Lake I seem to
remember that he is not at all clear about what causes the arytenoids
to tip forward or backward as can be observed during some vocal
functions.
It is my understanding that the vocal mechanism can only function
properly as a coordinated unit when its inner parts interwork with
each other and provide the required antagonistic symbiosis.
>In a message dated 7/14/01 10:18:18 AM Central Daylight Time,
>lloyd.hanson@n... writes:
>
>
>> Dear Randy:
>>
>> Thanks for the clarification. I basically agree. The medial
>> compression of which you speak I assume is applied by the same muscle
>> systems that are related to those which apply the longitudinal
>> tension unless, unbeknownst to me, there is a separate muscle system
>>
>
>The cricothyroids causes longitudinal tension in higher pitches (falsetto and
>head voice), the thyroarytenoids are the regulator of pitch in chest (and
>contribute to adduction somewhat in that register), but the main muscles that
>contribute to medial compression (not medial tension as you have stated
>several times), across all registers that compress, are the lateral
>cricoarytenoids (LCA) and the interarytenoids. It's in all the physiology
>books (see Zemlin) and every pedagogy book that is well researched.
>
>Randy Buescher
>
>
>
>
>
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--
Lloyd W. Hanson, DMA
Professor of Voice and Vocal Pedagogy, Emeritus
Director of Opera-Theatre, 1987-1997
School of Performing Arts
Northern Arizona University
Flagstaff, AZ
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