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  • Title: [The interrelationship of the pre- and postsynaptic elements in neuromuscular endings with different functional profiles in the frog Rana temporaria].
    Author: Radziukevich TL.
    Journal: Zh Evol Biokhim Fiziol; 1994; 30(3):420-3. PubMed ID: 7810265.
    Abstract:
    Simultaneous investigation of nervous elements and acetylcholinesterase activity in nerve-muscle endings of m. iliofibularis of the frog Rana temporaria revealed different pattern of innervation of muscle fibres of various functional types. Myelinated axons of motoneurones of intermediate muscle fibres, in contrast to phasic ones, do not exhibit preterminal or nodal branching, forming the terminals with relatively rich ramification, but with poor spatial distribution which does not exhibit evident orientation along the muscle fibre. Neuronal axons of tonic motor system, in contrast to those of phasic and intermediate ones, do not have myelin sheath at the vicinity of the innervated muscle fibre; each synaptic zone of polysynaptically innervated tonic muscle fibres is supplied by a bundle of axons which form short synaptic contacts along their way; a peculiar feature of neuronal axons of the tonic motor system is that they expand beyond the innervated synaptic zone.
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