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Biol Bull 121: 316-329. (October 1961)
© 1961 Marine Biological Laboratory
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THORACIC NEUROSECRETORY STRUCTURES IN BRACHYURA

I. GROSS ANATOMY 1 and DONALD M. MAYNARD 1

1 Bermuda Biological Station, and Department of Zoology, The University of Michigan Ann Arbor, Michigan

1. Three neurohaemal structures occur in the crab thorax: the pericardial organs (PO) in the pericardium; the anterior ramifications (AR) in a ventral sinus near the respiratory muscles; and the post-commissure organs, lateral to the esophagus and ventral to the stomach. Since the first segmental nerve supplies both PO and AR, the two are considered separate release sites of a single secretory complex.

2. The PO ranges between 0.00025 and 0.001% of total body weight in Bermuda crabs. It is largest in the most active species.




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