Morphology and ultrastructure of the organ of Bellonci in the marine amphipod Gammarus setosus

Journal of Morphology
V J Steele

Abstract

The three-dimensional structure of the organ of Bellonci in the marine amphipod Gammarus setosus and the relationship between its sensory cells and concretion are described using light, transmission, and scanning electron microscopy, with chemical treatment for cell lysis, calcium chelation, glycogen staining, and lanthanum labelling. The organ is encapsulated and has three units called fuselli. Each is enclosed by two fusellar cells which generate and release calcium granule strands into the cores of the fusellar concretions, which are united in the center of the organ. The surface of each fusellus is traversed by spiral dendrites entering dorsally and ending ventrally. The spiral dendrites arise from sensory neurons contained in a palm-shaped ganglion in the center of the capsule, beyond which they are twisted like a rope before reaching the concretion. The spiral dendrites are linked in pairs by gap and tight junctions and each gives origin to two pairs of 9+0 sensory cilia 30 μm apart. The ciliary distal segments give rise to long tubules which are in contact with the calcium granule strands. The ciliary proximal segments are expanded by many long mitochondria which interdigitate with the branched striated ciliary rootlets....Continue Reading

References

Oct 1, 1969·Zeitschrift für Zellforschung und mikroskopische Anatomie·E Dahl, C von Mecklenburg
Jan 1, 1972·Zeitschrift für Zellforschung und mikroskopische Anatomie·T Kauri, P S Lake
Feb 17, 1970·Proceedings of the Royal Society of London. Series B, Containing Papers of a Biological Character·G A Horridge, I A Meinertzhagen
Jan 1, 1969·Tissue & Cell·G A Horridge
May 1, 1971·The Journal of Cell Biology·R W Young

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