A morphological and cytochemical study of sarcoplasmic reticulum and T system of fish extraocular muscle.

Abstract

The sarcolemma and T system and the sarcoplasmic reticulum were studied in a fast acting muscle, the extraocular muscle of Fundulus grandis. The predominant morphological fiber type contained abundant glycogen, a highly developed T system with triads at the A-I junction and a well developed sarcoplasmic reticulum. The numerous tubular profiles of T system and sarcoplasmic reticulum with their characteristic contents made this fiber especially suitable for cytochemical investigation.