Implantation in Human



  • Implantation in Humans
  • Implantation duration and process
  • Implantation bleeding


Implantation in Humans:

The blastocyst remains free within the uterine cavity for about 2 days before it attaches to the uterine wall. The trophoblast gets attached to the endometrium. The inner cell mass gets differentiated from the embryo. After attachment, the uterine cells divide rapidly and cover the blastocyte. As a result, the blastocyst becomes embedded in the endometrium and the process is called as implantation. The endometrium enlarges and becomes more vascularized. The endometrium is referred as decidua. It is of three types:  

  1. Decidua basalis:  Portion of endometrium between the embryo and the stratum basalis of the endometrium. It provides a large amount of glycogen and lipids for the developing embryo and later becomes the maternal part of the placenta. 
  2. Decidua capsularis: Portion of the endometrium between the embryo and the uterine cavity.  
  3. Decidua parietalis: It is the remaining non- involved part of the endometrium not concerned with the embryo.
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