Eye muscles of the pike (Esox lucius) fiber types and their actomyosin ATPase and SDH activity.
The eye muscles of the pike are organized in two distinct populations of fibers arranged in semicircular layers. The distal layer, consisting of small diameter muscle fibers, is mainly made up of type I and tonic (slow) fibers. The central and proximal (facing the eyeball) parts of the eye muscles are occupied by IIB and IIC (fast) fibers. As a main criterion for identification of muscle fiber types, the reaction for actomyosin ATPase activity has been used: metabolic characterization of these fibers has been carried out on the basis of SDH activity.
Zawadowska
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Agiellonian University, Institut of Zoology, Department of Cytology and Histology, ul. M. Karasia 6, 30-060 Kraków, Poland.