title: A possible neuroendocrine system in polynoid polychaetes.
mesh_terms: D000818:Animals; D000845:Annelida / Q000033:anatomy & histology*; D001369:Axons / Q000166:cytology; D001808:Blood Vessels / Q000166:cytology; D001921:Brain / Q000166:cytology*; D003239:Connective Tissue Cells; D003593:Cytoplasm; D002479:Inclusion Bodies