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  • Title: Analysis of the birefringence of the smooth muscle anococcygeus of the rat, at rest and in contraction. I.
    Author: Godfraind-De Becker A, Gillis JM.
    Journal: J Muscle Res Cell Motil; 1988 Feb; 9(1):9-17. PubMed ID: 3392188.
    Abstract:
    The birefringence of the rat anococcygeus muscle was measured at rest and in contraction. A large increase (+30%) of the optical retardation was observed in muscles fully stimulated by Noradrenaline, in isometric conditions. This was associated with a reduction of the muscle thickness (-12%), so that the birefringence increased by 48%. These changes were reversed upon relaxation. The relationship between the birefringence increase and the mechanical response was investigated as a function of time and of Noradrenaline concentration. Possible origins for the birefringence increase are considered: an increased density of birefringent material, mainly filaments, seems the most likely explanation of the results.
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