| OCR Text |
Show 284 MR. R. ASSIIETON ON THE FCETUS AND [June 6, stated above, had been separated from the wall of the uterus, so although shown in situ in the figure it must be understood that the two parts were not together in my specimen. The line S marks the boundary between the two. On the outside I have drawn in outline the muscle coats (M) of the wall of the uterus. Within this, and seen only near the centre, is the trophospongial tissue alluded to above (TS), while towards the peripheral parts the thin layer of detritus can be seen at D, composed probably of both maternal and fcetal tissues. Text-fig. 44. A section through the junction between trophoblast and tropliospongia of Acomys. T. Trophoblast. TS. Trophospoiigia. EP. Pseudoepithelium of troplioblast. EP'. Pseudoepithelium of tropliospongia. MCH. Maternal blood. Everything within this line formed by the detritus layer on the outside and the trophospongial layer at the centre is probably foetal in origin, except the maternal blood, which is extravasated and flowing in channels excavated in the foetal trophoblast. It must of course be remembered that this description is an interpretation of a single stage based upon the known facts in closely allied forms (ref. Duval, Robinson, Jenkinson), and not upon the study of the actual development in this genus. |
