Document Detail


In situ biomechanics of the syrinx and sound generation in pigeons.
MedLine Citation:
PMID:  9286098     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The in situ biomechanics of the vocal organ, the syrinx, was studied in anesthetized pigeons using fiberoptic instruments. The role of syringeal muscles was determined by electrical stimulation, and phonation was induced by injecting gas into the subsyringeal air sacs. This study presents the first direct observations of the biomechanical processes that occur in an intact syrinx. Contraction of one of the syringeal muscles, the m. tracheolateralis (TL), withdraws the lateral tympaniform membranes (LTM) from the syringeal lumen, causing opening of the syringeal airways. Shortening of a second muscle, the sternotrachealis (ST), draws the syringeal cartilages closer to each other, causing the LTM to fold into the syringeal lumen. Maximal ST contraction does not lead to complete closure of the syrinx. As air-sac pressure is increased by the injection of gas, the LTM are drawn into the syringeal lumen and balloon in a rostral direction until they touch, thus forming a fold-like valve. Air-induced phonation is always associated with vibrations of the membrane folds, suggesting that pulsatile release of air into the trachea by vibratory motion of the LTM generates sound. During air-induced phonation, strong stimulation of the TL terminates sound generation by abducting the LTM, whereas weak stimulation changes the geometry of the membrane folds, which is accompanied by changes in the acoustic structure of the sound. Stimulation of the ST has little effect on air-induced sounds. The LTM appear to be the main sound generators, since disabling the medial tympaniform membranes (MTM) with tissue adhesive does not prevent phonation or change the frequency and amplitude structure of display coos in spontaneously vocalizing pigeons. Moreover, the activity of the syringeal muscles appears to have a mainly modulatory function, suggesting that the basic sound-generating mechanism is similar in both air-induced and natural phonation.
Authors:
F Goller; O N Larsen
Related Documents :
14603058 - Three-dimensional reconstruction of immunolabeled neuromuscular junctions in the human ...
624998 - The effects of artificial lung inflation on reflexly induced bradycardia associated wit...
17143878 - Intrinsic laryngeal muscles are spared from myonecrosis in the mdx mouse model of duche...
9443828 - Effect of stimulating peripheral and central neural pathways on pharyngeal muscle contr...
2454288 - Regeneration restores some of the altered electrical properties of axotomized bullfrog ...
23252598 - (-)-epicatechin is associated with increased angiogenic and mitochondrial signalling in...
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The Journal of experimental biology     Volume:  200     ISSN:  0022-0949     ISO Abbreviation:  J. Exp. Biol.     Publication Date:  1997 Aug 
Date Detail:
Created Date:  1997-09-29     Completed Date:  1997-09-29     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0243705     Medline TA:  J Exp Biol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  2165-76     Citation Subset:  IM    
Affiliation:
Center for Sound Communication, Odense University, Denmark. fgoller@indiana.edu
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Air
Animals
Biomechanics
Columbidae / anatomy & histology,  physiology*
Electric Stimulation
Endoscopy
Male
Muscle, Skeletal / physiology
Vocalization, Animal / physiology*
Grant Support
ID/Acronym/Agency:
NS 29467/NS/NINDS NIH HHS

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Sublingual plicae (anterior processes) are not necessary for garter snake vomeronasal function.
Next Document:  Mechanics of locomotion in lizards.