A text-book of obstetrics / by J. Clarence Webster.

  • John Clarence Webster
Date:
1903
Catalogue details

Licence: Public Domain Mark

Credit: A text-book of obstetrics / by J. Clarence Webster. Source: Wellcome Collection.

    52/810 page 46
    At different points the outer processes of the trabeculae pene- trated maternal blood-sinuses, the communication with the troph- oblastic lacunze being undoubtedly established in this way. The trophoblastic strands between the lacune are to be fegarded as the primitive villi, being entirely epiblastic. During the second week the fetal mesoblast begins to penetrate them, forming the connective-tissue core, in which capillaries gradually develop. Many of the strands attached to the decidua give rise to future permanent villus-stems. New villi very soon begin to develop, the earliest forms being buds of fetal epiblast. The original lacunae in the trophoblast increase in size, forming the permanent intervillous space, in which the maternal blood circulates around the villi. On the surface of the decidua is found a well-marked, irregular layer of plasmodial, nucleated protoplasm identical with the syncytium found on the outer part of the chorion and villi, and in many places continuous with it. Irregular masses of this syncytium, some of which are reticulated, project from the
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