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Active and passive properties of canine abduction/adduction laryngeal muscles
Journal article   Peer reviewed

Active and passive properties of canine abduction/adduction laryngeal muscles

Fariborz Alipour, Ingo R Titze, Eric Hunter and Niro Tayama
Journal of voice, Vol.19(3), pp.350-359
09/01/2005
DOI: 10.1016/j.jvoice.2004.04.005
PMCID: PMC1552101
PMID: 16102663
url
http://doi.org/10.1016/j.jvoice.2004.04.005View
Open Access

Abstract

Active and passive characteristics of the canine adductor- abductor muscles were investigated through a series of experiments conducted in vitro. Samples of canine posterior cricoarytenoid muscle (PCA), lateral cricoarytenoid muscle (LCA), and interarytenoid muscle (IA) were dissected from dog larynges excised a few minutes before death and kept in Krebs-Ringer solution at a temperature of 37 degrees C +/- 1 degree C and a pH of 7.4 +/- 0.05. Active twitch and tetanic force was obtained in an isometric condition by applying field stimulation to the muscle samples through a pair of parallel-plate platinum electrodes. Force and elongation of the samples were obtained electronically with a dual-servo system (ergometer). The results indicate that the twitch contraction times of the three muscles are very similar, with the average of 32 +/- 1.9 ms for PCA, 29 +/- 1.6 ms for LCA, and 32 +/- 2.4 ms for IA across all elongations. Thus, PCA, LCA, and IA muscles are all faster than the cricothyroid (CT) muscles but slower than the thyroarytenoid (TA) muscles. The tetanic force response times of these muscles are also similar, with a maximum rate of force increase of 0.14 N/ms.
 Animals Dogs Electric Stimulation Laryngeal Muscles - physiology Models, Biological Muscle Contraction - physiology Reaction Time Vocal Cords - physiology

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