Oct 30, 1975

The jumping mechanism of Xenopsylla cheopis. II. The fine structure of the jumping muscle

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
M J Cullen


The ultrastructure of the trochanteral depressor muscle of the oriental rat flea is described. It is shown to be similar to that of the tubular leg muscles of other insects except in the volume and arrangement of the sarcoplasmic reticulum. The sarcoplasmic reticulum occupies approximately 18% of the volume of the muscle fibres. It is in three configurations:a regular array of parallel tubules opposite the A-band, a collar of sacculi involved in the formation of the dyads at the edge of the A-band and a loosely woven arrangement of tubules around the I-band. This tripartite arrangement of the sarcoplasmic reticulum and its large surface area is discussed in relation to the action of the muscle as the main propulsive muscle in the jump of the flea.

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Mentioned in this Paper

Skeletal Muscle Structure of Lower Leg
Plant fiber
Electron Microscopy
Sarcoplasmic Reticulum
Muscle Fibers
Tissue Fiber

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