Abstract
AbstractSmith, K. S. Contraction in intramural muscle fibres of Venous leaves following stimulation of their motor nerves. Acta physiol. scand. 1964. 62. 195–208. — The contractile behaviour of amphibian intramural muscle fibres following stimulation of their motor nerves was investigated by cinephotography of the changing sarcomere length. Two types of intrafusal muscle fibre were distinguished: large and small. Small intrafusal muscle fibres were supplied by small diameter motor nerves and had a longe: lasting contraction than the large intrafusal fibres which were supplied by large diameter motor nerves. Contraction was a propagated event in both large and small muscle fibres following single nerve stimuli. At high stimulation frequencies the contraction was not propagated through the complete length of the large muscle fibres. Evidence was obtained that the large muscle fibres contained, in the region of sensory contacts, zones which were less stiff than the resting striated muscle fibre and that the small muscle fibres did not contain such zones. Some observations were also made on spontaneous contraction in these muscle fibres.
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