Ultrastructure of Nerve Endings in the Stapedius Muscle of the Squirrel Monkey
作者:
Toshio Yoshihara,
Hidemi Kaname,
Tetsuo Ishii,
Makoto Igarashi,
期刊:
ORL
(Karger Available online 1993)
卷期:
Volume 55,
issue 1
页码: 18-23
ISSN:0301-1569
年代: 1993
DOI:10.1159/000276347
出版商: S. Karger AG
关键词: Stapedius muscle;Neuromuscular junction;Muscle-tendon junction;Tendon receptor;Squirrel monkey
数据来源: Karger
摘要:
The stapedius muscle of the squirrel monkey (Saimiri sciureus) was studied electron microscopically with regard to neuromuscular junctions, muscle-tendon junctions and tendons. Two types of neuromuscular junctions were identified. The first type which was predominant in number showed well-developed primary and secondary synaptic clefts. They were almost the same with those of other mammalian skeletal muscles. The second type showed a flat-shaped junction with fewer secondary synaptic clefts. Muscle-tendon junctions were characterized by many interdigitations between the muscle fibers and tendon. The tendon was composed of collagen fibers, approximately 70-100 nm in diameter. Muscle spindles were not present, while nerve endings resembling the Golgi tendon organ were found adjacent to the tendon and the muscle-tendon junctions. These findings suggest that a feedback system may exist and regulate the fine contractile function of this muscle.
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