The fine structure of cephalopod blood vessels
Tóm tắt
The fine structure of blood vessels of the retina and arms of Octopus and the lip of Sepia is described. There are two main types of vessels. The first type (type 1) has a complete basement membrane, an incomplete lining of endothelial cells formed into finger—like processes, and a complete investment of pericytes surrounding the vessel. These latter cells contain myofilaments. The second type (type 2) is smaller and contains few if any myofilaments, and has a less complexly folded endothelium. This type is subdivided into three forms depending on the number of pericytes and the form of the endothelial lining. Amoebocytes are described and these form a distinct group of cells. The fine structure of hemocyanin is observed in normally fixed material and is correlated with its previously described structure. These observations are related to their possible functional importance.
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