ABSTRACT
The use of the crop and gizzard of the earthworm as a convenient smooth-muscle preparation was first suggested by Mines (1907). The pharmacological properties of this preparation have recently been described by Wu (1939). His experiments and Millott’s (1943) have shown that the digestive tract of the earthworm, including the crop and gizzard, is reciprocally innervated. The nerve fibres concerned are cholinergic in the augmenter and adrenergic in the inhibitory nerves.
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We are indebted to Mr E. N. Willmer for examining our sections arid confirming the nervous nature of these cells.
Copyright © 1945 The Company of Biologists Ltd.
1945
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