File:Berkeley1905 fig04.jpg

Fig. 4. Transverse section of the pregnant tube.

A. Mesosalpinx. BB. Cells of the Trophoblast. C. Circular muscle coat. D. Longitudinal muscle coat. E. Villus. IF. Gestation sac. G. Muscle fibres undergoing fibrinoid change. H. Syncytium. The gestation sac, it will be noticed, is bounded by a. zone of trophoblast cells and librinined muscle constituting the “ cell sheet."

Fig. 4 reproduces the appearances shown by a section taken a millimetre nearer the uterus. A definite gestation sac is now seen, which lies to one side of the lumen of the tube, chiefly towards the attachment of the mesosalpinx. It is separated from the lumen by the circular coat of muscle.

The wall of the sac is formed by muscular tissue densely infiltrated by trophoblast cells (the “ cell-sheet ”). The sec surrounds the circular muscle coat for about one-half of its circumference, whilst around the remaining half the trophoblast cells can be traced efiecting a delamination of the muscle fibres, and particularly tending to split the longitudinal from the circular muscle coat. Wherever the maternal tissue is in contact with the cells of the trophoblast, evidence of extensive fibrinous degeneration is met with, the muscle bundles becoming indistinct and homogeneous, and eventually forming layers of somewhat concentrically laminated fibrin.

Reference

Berkeley C. and Bonney V. Tubal Gestation - A Pathological Study. (1905) Brit. J. Obst. and Gyn. 7(2): 78-96.

Cite this page: Hill, M.A. (2024, April 30) Embryology Berkeley1905 fig04.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Berkeley1905_fig04.jpg

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