. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. GOVIND ET AL. FIGURE 3. Enlarged view of part of Figure 2F showing cross-section of closer muscle fibers stained for NADH diaphorase. Staining is restricted to the circumference in all phasic (P) and some tonic (T) fibers; in other tonic (T) fibers the staining subdivides the fiber extensively, denoting a more widespread distribution of mitochondria. Scale mark, mm. of the A-band have been reported during contraction (Dewey et al., 1977) they are so minute as to escape detection by conventional measuring techniques. Wher
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. GOVIND ET AL. FIGURE 3. Enlarged view of part of Figure 2F showing cross-section of closer muscle fibers stained for NADH diaphorase. Staining is restricted to the circumference in all phasic (P) and some tonic (T) fibers; in other tonic (T) fibers the staining subdivides the fiber extensively, denoting a more widespread distribution of mitochondria. Scale mark, mm. of the A-band have been reported during contraction (Dewey et al., 1977) they are so minute as to escape detection by conventional measuring techniques. Whereas the determination of fiber types based on enzyme histochemistry dealt with the entire closer muscle, that based on sarcomere length was restricted to the dorsal surface (Fig. 1). For determining sarcomere length, fibers were taken from the two ends of the muscle, , proximal and distal areas, and from the center, thus avoiding overlap in sampling among the three regions. A total of 25 fibers were examined from each area. Two distinct types of fibers were found, and these occurred regionally (Fig. 4). Fibers with short sarcomeres and A-bands charac- teristic of phasic type occurred in the central region, while those with long sar- comeres and A-bands characteristic of tonic type were at the two ends of the muscle (Fig. 4). Innervation by FCE and SCE axons Innervation received by muscle fibers from the two excitor axons, FCE and SCE, on the dorsal surface of the closer muscle was determined by electrophysi- ological techniques. Since the FCE axon has a higher conduction velocity than the SCE axon (Wiersma, 1955; Hoyle and Wiersma, 1958; Govind and Lang, 1974), its action potential preceded that of the SCE axon in extracellular recordings from the closer nerve (Fig. 1). Recordings of muscle excitatory junctional potentials. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance o
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
