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SummaryA study was carried out on adrenergie innervation of the white adipose tissue by means of the Falck and Owman fluorescence method. The presence of abundant perivascular plexuses, which could be followed up to the level of the vascular capillaries, was demonstrated. The nerve fibers run like "puttees" around the capillaries. The adrenergie nerve fibers establish close contacts with the surface of the fat cells. The fat cells in the immediate vicinity of the vessels are provided for by the perivaseular nerve fibers. In the adipose lobules adrenergie networks showing large meshes were observed. The adrenergic nerve fibers show also close contacts with the mast cells. Mast cells may be found both in the meshes of the perivascular plexuses and along the fibers supplying the fat cells.

Numerous electron-opaque deposits appear in the SR of the relaxed smooth muscle cells of the guinea pig Taenia coli that had been treated, before fixation, with a depolarizing medium containing oxalate to precipitate calcium ions in situ. X-ray spectra obtained by spot and line-scanning analyses of these deposits in situ show characteristic calcium signals, thus providing direct evidence for calcium accumulation inside the sarcoplasmic reticulum of smooth muscle.

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