Abstract
The efferent venous system of Sepia officinalis gills was examined by scanning electron microscopy and the vascular cast technique. The gill laminae showed a regular but complex architecture. The shape of the wall indicates some contractile activity, especially in second-order vessels. At high magnification the surface showed an unevenness, on the whole “wrinkled” for the presence of gibbosity and small fossae, probably due to the drawing in of cells of the vascular wall. The presence of pores, microvilli and vescicles suggests an exchange activity and exocytosis of the cellular components of the vessel wall.
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