title: Neurosecretion in the sinus gland of the fiddler crab, Uca pugnax.
abstract: The ultrastructure of the sinus gland of the fiddler crab, Uca pugnax, was investigated and found to be similar to that in other crustaceans. Five types of neurosecretory axon terminals were tentatively identified on the basis of the size, shape, and electron density of granules within the axons. Release of neuro-secretory material appears to be by exocytosis.
mesh_terms: D000818:Animals; D001369:Axons / Q000648:ultrastructure; D003386:Brachyura / Q000648:ultrastructure*; D003594:Cytoplasmic Granules / Q000648:ultrastructure; D005089:Exocytosis; D005260:Female; D009489:Neurosecretion; D009490:Neurosecretory Systems / Q000648:ultrastructure*