Fast deformation calorimetry on muscle-fibre bundles

The gizzard of the herbivorous domestic goose, Anser anser, was investigated in order to understand how it can break down food such as grass. The gizzard consists of two thick opposing muscles that are joined on its dorsal and ventral surface by large tendons. The long axis of the fibre bundles of these muscles are aligned with the rigid lumen of the gizzard. Thus, the distance between the two tendons cannot decrease during contraction. Instead, contractions reduce the curvature of the muscle fibre bundles. This reduction in curvature and associated swelling of the muscle bundles generates forces in the lumen of the gizzard. However, as the thick muscles are asymmetrical, these forces generate translational rather than simple compressive movements. Such movement is also suggested by the wear on the lining of the gizzard lumen. A band of thin muscle runs perpendicular to the thick muscles and positions the food in the lumen in readiness to allow for food breakdown by the thick muscles.

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Relaxation of Glycerol-extracted Muscle Fibre Bundles Induced by Zinc in the Presence of ATP and Other Polyphosphates.

Acta Physiologica Scandinavica ◽

10.1111/j.1748-1716.1959.tb01737.x ◽

1959 ◽

Vol 46 (1) ◽

pp. 62-87 ◽

Cited By ~ 8

Author(s):

K. A. PAUL EDMAN

Keyword(s):

Muscle Fibre ◽

Fibre Bundles

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The distribution of developing Brugia pahangi and Brugia malayi larvae within the dorsal longitudinal flight muscles of Aedes aegypti and Mansonia uniformis

Parasitology ◽

10.1017/s0031182000067469 ◽

1971 ◽

Vol 63 (1) ◽

pp. 119-124

Author(s):

Evelyn B. Beckett

Keyword(s):

Aedes Aegypti ◽

Muscle Fibre ◽

Longitudinal Muscle ◽

Principal Factor ◽

Serial Sections ◽

Kuala Lumpur ◽

Fibre Bundles ◽

Significant Difference ◽

Flight Muscles ◽

Mansonia Uniformis

1. The distribution of larvae within the dorsal longitudinal muscle fibre groups of A. aegypti infected with subperiodic B. malayi or B. pahangi and of M. uniformis infected with the former parasite was studied with the aid of serial sections.2. In all experiments the top bundles of fibres contained fewer parasites than either the middle or lowest bundles, but whereas most parasites were concentrated in the middle bundles in A. aegypti there was no significant difference in M. uniformis between the bottom and middle fibre bundles. The lowermost fibre was not the most heavily parasitized of the dorsal longitudinal group.3. Nothing is known of what determines whether or not a particular fibre becomes parasitized, but it was concluded that the distance between the fibre and the gut (from which the parasites emerge to travel to the muscle) is not the principal factor.I am very much indebted to Mr Cheong Weng Hooi and his colleagues for collecting and processing mosquitoes in Kuala Lumpur and to Mrs J. Oliver who finished the processing in Liverpool. I am grateful also to Dr W. W. Macdonald for his advice and help in all stages of this work and to Miss M. A. Johnson who assisted with the care of the A. aegypti colony and prepared the diagrams for this paper.

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