440 THE PHYSIOLOGY OF REPRODUCTION 



smaller size appears later in the lumen and wall of the implanta- 

 tion cavity. Jenkinson also recognised two groups, but assigned 



mph, 



sym. 



-I. 



FIG. 106. Longitudinal section of the implantation cavity of the field- 

 mouse about the eighth day of pregnancy. (From Disse's "Die 

 Vergrosserung der Eikammer bei der Feldmaus (Arvicola arvalis)" A /<//. 

 f. mikr. Anat , vol. Ixviii., 15)06.) 



p.l., placental pole ; mph, macrophages or giant-cells ; sym, uterine 

 symplasma ; I, blood lacuna. 



to them different origins, foetal in the " Eikammer " and 

 maternal in the decidua. 



All authorities agree that they are phagocytic. The tissue 



