File:Fujimura1921 plate01.jpg

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Plate 1 syncytium layer and a part of the Langhans’ cells

1 to 12 Illustrate the syncytium layer and a part of the Langhans’ cells.

Figure 1 the syncytium presents a homogeneous protoplasmic layer generally dark-colored and contains an extremely large quantity of plastosomes (mitochondria). They are of different shapes, but mostly are rod-shaped or bacteroid and of different lengths, the longer ones being slightly curved. They arrange themselves in groups rather than being equally distributed over the layer, and in some places some of them point in the same direction, while others point in Various directions, thus in general giving them something of a meshy arrangement. The nuclei are clear and have in themselves a more or less conspicuous nuclear network, with one or two nucleoli.

Figure 2 the syncytium layer closely resembles figure 1 in structure, though the plastosomes contained therein differ from one another in their shape, arrangement, and number. These two figures show the simplest structure of the syncytium layer.

Figure 3 the plastosomes are generally faint and quite scattered; in the protoplasm there are some dark-colored granular bodies of different sizes and a small number of vacuoles; the smaller granules are somewhat dark in color and are generally found very near the surface, viz., the brush-like border, whereas the larger ones are light-colored and are found in other parts of the layer. The vacuoles are found close to the Langhans’ layer. The nuclei are irregular in shape, and besides the nuclear network there are one or two nuceoli.


Fujimura G. Cytological studies on the internal secretory functions in the human placenta and decidua. (1921) J Morphol. 35(3): 486-576.

Cite this page: Hill, M.A. (2024, February 21) Embryology Fujimura1921 plate01.jpg. Retrieved from

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

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