caa a22 4500 469081678 CHVBK 20180323132952.0 cr unu---uuuuu 170328e19920401xx s 000 0 eng 10.1007/BF00338062 doi (NATIONALLICENCE)springer-10.1007/BF00338062 Neurosecretion of the mediodorsal cells of the central nervous system of the snail Helisoma duryi [Elektronische Daten] [Hamid Khan, A. Saleuddin] Summary: The neurosecretory mediodorsal cells that produce a putative growth hormone of the snail Helisoma duryi were studied in fast-growing virgin snails and in slow-growing reproducing snails. There are about 60 mediodorsal cells in clusters on each side of the cerebral commissure of the central nervous system, and they contain dense-cored granules which are 100-200 nm in diameter. The cells of virgin snails have dense Golgi bodies, scattered ER cisternae, and few granules, while those of reproducing snails have pale Golgi bodies, stacked ER cisternae, and numerous granules. Thus the mediodorsal cells of the virgin snails appear to be more active synthetically than those of the reproducing snails. The cells near the endocrine dorsal bodies contain many dorsal body precesses in their membrane interdigitations. There are junction-like interactions between some of the interdigitations. Gap junction-like contacts are seen between mediodorsal cells and glial cells. The axon endings of the mediodorsal cells at the neurohemal area in the labial nerve show more release profiles in virgin snails than in reproducing snails. A daily pattern of release has been observed in reproducing snails, and rates of release are higher in the evening than in the morning. Springer-Verlag, 1992 Neurosecretion nationallicence Exocytosis nationallicence Growth nationallicence Endocrine gland nationallicence Cell junctions nationallicence Helisoma duryi (Mollusca) nationallicence Khan Hamid Department of Biology, York University, M3J 1P3, North York, Ontario, Canada aut Saleuddin A. Department of Biology, York University, M3J 1P3, North York, Ontario, Canada aut Cell and Tissue Research Springer-Verlag 268/1(1992-04-01), 131-139 0302-766X 268:1<131 1992 268 441 https://doi.org/10.1007/BF00338062 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00338062 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Khan Hamid Department of Biology, York University, M3J 1P3, North York, Ontario, Canada aut NATIONALLICENCE 700 1- Saleuddin A. Department of Biology, York University, M3J 1P3, North York, Ontario, Canada aut NATIONALLICENCE 773 0- Cell and Tissue Research Springer-Verlag 268/1(1992-04-01), 131-139 0302-766X 268:1<131 1992 268 441 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer