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The Innervation of the Frog's Heart. III. Electronmicroscopy of the Autonomic Nerve Fibres and their Vesicles

R. I. Woods
Proceedings of the Royal Society of London. Series B, Biological Sciences
Vol. 176, No. 1042 (Oct. 13, 1970), pp. 63-68
Published by: Royal Society
Stable URL: http://www.jstor.org/stable/76082
Page Count: 14
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The Innervation of the Frog's Heart. III. Electronmicroscopy of the Autonomic Nerve Fibres and their Vesicles
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Abstract

The electronmicroscopic appearance of the autonomic nerve fibres in the frog's heart has been examined. The parasympathetic postganglionic fibres are typically cholinergic and have only a few cored vesicles amongst numerous small agranular ones. The sympathetic postganglionic fibres contain adrenaline and it is present in two types of vesicle, one is large (90 nm) and has an osmiophilic core, whilst the other is smaller (40 nm) and has no core unless the adrenaline is stained by the sodium dichromate/acrylic aldehyde method. There are also two types of noradrenaline-containing vesicles in mammalian nerves. These are compared with the vesicles in the frog nerves: there appear to be no differences other than the catecholamine stored.

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