A histochemical characterization of muscle fiber types in the middle ear muscles of the cat. 1. The stapedius muscle.

Abstract:

:The muscle fiber content of the stapedius muscle of the cat was determined histochemically using a combination of oxidative enzymes and glycolytic markers. The major fiber type present was determined to be the fast oxidative glycolytic type (FOG; 77%). Two other types of fiber were found that could not be placed into any of the classical muscle fiber categories. One of these fibers had little staining for actomyosin ATPase (1', 13%) while the other stained densely for this enzyme (2', 10%). These fibers could also be separated using fiber diameter as a criterion. The mean diameters of these different fibers were 22.8 Mm+/-6.3 (FOG fiber type), 14.8 micrometers+/-3.7 (1' fiber) and 14.9 micrometers+/-5.5 (2' fiber). Since the predominant fiber type (FOG) is adapted for fast contraction and fatigue resistance, the stapedius muscle of the cat is probably capable of fast repetitive contractions, a conclusion that fits well with much of the physiological data. Due to the fact that the 2' fibers were always paired with the 1' fibers, it is conceivable that these pairs may represent some specialized sensory structures (i.e. unencapsulated muscle spindles).

journal_name

Acta Otolaryngol

journal_title

Acta oto-laryngologica

authors

Lyon MJ,Malmgren LT

doi

10.3109/00016488209128894

subject

Has Abstract

pub_date

1982-07-01 00:00:00

pages

99-109

issue

1-2

eissn

0001-6489

issn

1651-2251

journal_volume

94

pub_type

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