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Cholinergic Innervation of Muscle Fibres in Squid

Published online by Cambridge University Press:  11 May 2009

Q. Bone ,
A. Packard  and
A. L. Pulsford
Q. Bone
Affiliation:
Department of Physiology, University Medical School, Teviot Place, Edinburgh, EH8 9AG
A. Packard
Affiliation:
The Laboratory, Marine Biological Association, Citadel Hill, Plymouth, PL1 2PB
A. L. Pulsford
Affiliation:
Department of Physiology, University Medical School, Teviot Place, Edinburgh, EH8 9AG
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Extract

INTRODUCTION

The small squid Alloteuthis, and the larger Loligo have elongate mantles chiefly made up of two distinct types of circular muscle fibres, partitioned by thin sheets of radial muscle fibres (Bone, Pulsford & Chubb, 1981).

Nerve terminals on both types of circular fibre and upon radial fibres contain 50 nm electron-lucent vesicles; preliminary pharmacological investigations (Bone & Howarth, 1980) indicate that L-glutamate is the excitatory transmitter at the terminals upon the circular fibres. In other cephalopods, such as Sepia, and the squids Lepidoteuthis and Taningia (Clarke & Maul, 1962; Clarke, 1967) there are in addition to the circular and radial fibres, layers of longitudinal muscle fibres in the mantle. Such longitudinal fibre layers are lacking over the greater part of the mantle in Alloteuthis and Loligo. In this note, we show that they are present only around the anterior margin of the mantle in these two squid, and that both these anterior longitudinal fibres and the radial fibres of the mantle are insensitive to L-glutamate, but contract in response to acetylcholine, as do the retractor muscles of the head and arms, and the siphon muscles.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 62 , Issue 1 , February 1982 , pp. 193 - 199
Copyright
Copyright © Marine Biological Association of the United Kingdom 1982

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References

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