PMID: 14399190Jul 1, 1960Paper

The fine structure of some blood vessels of the earthworm, Eisenia foetida

The Journal of Biophysical and Biochemical Cytology
K HAMA

Abstract

The fine structure of the main dorsal and ventral circulatory trunks and of the subneural vessels and capillaries of the ventral nerve cord of the earthworm, Eisenia foetida, has been studied with the electron microscope. All of these vessels are lined internally by a continuous extracellular basement membrane varying in thickness (0.03 to 1 micro) with the vessel involved. The dorsal, ventral, and subneural vessels display inside this membrane scattered flattened macrophagic or leucocytic cells called amebocytes. These lie against the inner lining of the basement membrane, covering only a small fraction of its surface. They have long, attenuated branching cell processes. All of these vessels are lined with a continuous layer of unfenestrated endothelial cells displaying myofilaments and hence qualifying for the designation of "myoendothelial cells." The degree of muscular specialization varies over a spectrum, however, ranging from a delicate endowment of thin myofilaments in the capillary myoendothelial cells to highly specialized myoendothelial cells in the main pulsating dorsal blood trunk, which serves as the worm's "heart" or propulsive "aorta." The myoendothelial cells most specialized for contraction display well organi...Continue Reading

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Citations

Jan 1, 1971·Zeitschrift für Zellforschung und mikroskopische Anatomie·N J Abbott
Jan 1, 1969·Zeitschrift für Zellforschung und mikroskopische Anatomie·P N Dilly
Jan 1, 1967·Zeitschrift für Zellforschung und mikroskopische Anatomie·A Cecio
Sep 3, 1964·Zeitschrift für Zellforschung und mikroskopische Anatomie·K G BENSCHL MILLER
Dec 10, 1965·Zeitschrift für Zellforschung und mikroskopische Anatomie·A Irisawa, K Hama
Jan 1, 1967·Zeitschrift für Zellforschung und mikroskopische Anatomie·V C Barber, P Graziadei
Jun 16, 1965·Zeitschrift für Zellforschung und mikroskopische Anatomie·V C Barber, P Graziadei
Jan 1, 1970·Zeitschrift für Zellforschung und mikroskopische Anatomie·R P Dales, J S Pell
Feb 1, 1962·The Journal of Cell Biology·A R MUIR, A PETERS
Nov 1, 1962·The Journal of Cell Biology·J V FREI
May 1, 1963·The Journal of Cell Biology·T YAMAMOTO
May 1, 1965·The Journal of Cell Biology·T YAMAMOTOA TONOSAKI
May 22, 2010·Cellular and Molecular Life Sciences : CMLS·Boris StrilićEckhard Lammert
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Mar 27, 1995·Annals of the New York Academy of Sciences·M G Martynova
Oct 9, 2019·Annual Review of Cell and Developmental Biology·Marta SegarraAmparo Acker-Palmer

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