Scanning Electron Microscopic Study on the Saccus Vasculosus of the Rainbow Trout

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Abstract
Both free and cracked surfaces of the saccus vasculosus in adult rainbow trout (Salmo gairdneri) were investigated by scanning electron microscopy (SEM). The saccus vasculosus was a rich-folded epithelium composed of highly specialized coronet cells, supporting cells and presumable liquor-contact neurons. The coronet cells were characterized by both numerous specialized cilia, so-called globules projecting into the saccus lumen and abundant smooth endoplasmic reticulum in the cytoplasm. By the appearance of these globules, coronet cells were roughly divided into 2 types: botryoidal coronet cells and flower-like. The former was supplied with grape-shaped globules, whose density is 60-80 pieces/cell. The latter contained club-shaped or petal-shaped globules, which numbered 50-60 pieces/cell. The functional significance of these globules was discussed. The free surface of the supporting cells was relatively smooth, and short microvilli lay scattered on the surface. The cells called liquor-contact neurons (the 3rd type) possessed a head-like protrusion where long solitary cilia can be recognized.

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