By john rothwell

This accomplished textbook illustrates the buzz and the problems of operating on the interface among natural and utilized examine. Written with the scholar firmly in brain, the textual content presents a concise account of the elemental anatomy and serve as of the components of the CNS interested in controlling physique move. medical details is built-in all through and, anywhere attainable, information of proper experiments given.

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These experiments on tibialis anterior also illustrate the effect of Effects of muscle properties on control of movement 25 changing muscle length on the twitch contraction time. When the ankle is dorsiflexed and the muscle short, the duration of a single twitch contraction is short; when the ankle is plantarflexed and the muscle extended, the twitch contraction time is longer. The result is that the twitches summate more readily when the muscle is long. 13). Force-velocity curves for a single human muscle have not been obtained.

However, a more common way of estimating the average number of fibres per unit in different muscles is to count the total number of fibres in the muscle and divide by the number of motor axons in the muscle nerve. In animal experiments, counts of motor axons usually are made one to two weeks after deafferentation by section of the dorsal roots. Obviously, in human material, such pre-treatment is not possible: estimates of the number of motor fibres are made by counting the number of large axons (greater than 7-8 ~m diameter) in intact muscle nerves, and then assuming 40-50% of these are sensory axons.

Approx . 1 Reconstruction of the territory of a single motor unit in the medial gastrocnemius muscle of the cat. A single motor axon, innervating a type FF unit, was stimulated repetitively so as to fatigue the muscle fibres which it innervated. Fatigue depletes fibres of their glycogen reserve (see text) . The muscle was then quickly excised and frozen and stained for fibres showing glycogen depletion using the periodic acid-Schiff method. The position of identified fibres is shown in the sections of muscle taken on the right.

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