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Motor End-plate Distribution in the Human Interarytenoid Muscle
James Freije, MD;
Leslie T. Malmgren, PhD;
Richard R. Gacek, MD
Arch Otolaryngol Head Neck Surg. 1987;113(1):63-68.
Abstract
• Histochemical and computer graphic techniques were used to determine the distribution of neuromuscular junctions in the human interarytenoid (IA) muscle. The motor end-plates of four IA specimens obtained from normal postmortem larynges were visualized using an acetylcholin-esterase stain. The three-dimensional distribution of motor end-plates was later reconstructed using computer graphics. The motor end-plates in the IA were found to be distributed in an inverted "Y" configuration. A broad band of end-plates was found at the midpoint of the muscle fibers in the superior and middle aspect of the muscle. This band divided obliquely in a lateral direction toward the inferior border of the muscle. This pattern of motor end-plate distribution is possibly consistent with the bilateral innervation of the IA by the recurrent laryngeal nerves.
(Arch Otolaryngol Head Neck Surg 1987;113:63-68)
Author Affiliations
From the Department of Otolaryngology and Communication Sciences, State University of New York-Health Science Center, Syracuse (Drs Freije, Malmgren, and Gacek), and the Veterans Administration Medical Center, Syracuse, NY (Dr Gacek).
Footnotes
Accepted for publication June 10, 1986.
Reprint requests to Department of Otolaryngology and Communication Sciences, State University of New York-Health Science Center, 766 Irving Ave, 156 Weiskotten Hall, Syracuse, NY 13210 (Dr Malmgren).
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