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January 1987

Motor End-plate Distribution in the Human Interarytenoid Muscle

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).

Arch Otolaryngol Head Neck Surg. 1987;113(1):63-68. doi:10.1001/archotol.1987.01860010067017

• 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)

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