ÜBER DEN M. THYREOARYTAENOIDEUS DES RHESUSAFFEN

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Abstract
A study of the thyreoarytenoid muscle of rhesus monkey to enable a comparison of its appearance with the human was undertaken. The same methods used were micro-dissection, histo-chemical staining of cholinesterase-positive elements by the thiocholin method and, thereafter the isolation of single muscle fibers under the dissecting microscope. The origin of the muscle lies not on the thyroid cartilage itself, but on a[long dash]essentially sagitally oriented[long dash]plate of connective tissue, the "aponeurosis thyreoidea". The muscle inserts on the arytenoid cartilage in a band-shaped strip, running cranial-laterally to caudal-medially and forming an angle with the horizontal of about 45[degree]. A vocal cord does not exist, therefore relations between the muscle and connective tissue of the cord cannot be discussed. The intramuscular connective tissue is extremely loose. On a laryngeal cross-section the sphincter-like arrangement of the fibers can be seen. Contrary to conditions in man, most of the fibers go from origin to insertion without interruption. No intermediate tendons or other intramuscular endings could be seen. No differences of calibre between the single fibers exist. Most fibers contain a motor end plate, lying in the middle third of the fiber length. Single fibers are multiply innervated. The subneural apparatus of the end plates shows no great variation of form or dimensions. In comparison with the human muscle the thyreoarytenoid muscle of rhesus monkey shows only a minutely small number of cholinesterase positive receptors.

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