THE NUMBER AND DISTRIBUTION OF MUSCLE-SPINDLES AND TENDON ORGANS IN THE PERONEAL MUSCLES OF THE CAT

  • 1 April 1987
    • journal article
    • research article
    • Vol. 151, 143-155
Abstract
An analysis has been made of the numbers and distributions of muscle spindles and tendon organs in the three peroneal muscles of the lower hindlimb of the adult cat. Both peroneus brevis and tertius were richly supplied with spindle capsules and tendon organs in comparison with peroneus longus and other muscles of the cat''s lower hindlimb. A large number of the capsules in each muscle was involved in tandem linkages, some of these capsules comprising only a bag2 and some chain fibres. Such capsules were especially prevalent in peroneus tertius. The numbers of extrafusal muscle fibres inserting into each tendon origin indicated that the activity of each motor unit should be monitored by at least one tendon organ. The distributions of the receptors are discussed in relation to the proportion and density of oxidative muscle fibres.