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This article is a continuation of my embryology series if you have not read about blastulation, I recommend you reading it before reading this article and you can do that by reading my  article . If you are done with that article then you are good to go. So we left the last article on blastocyst, before moving further in embryology part, I want to tell you some things that will ease the process of understanding the super detailed process of embryology So what was the product after blastulation – it was blastocyst right, well yes but remember the term “Blastocyst” is used only for mammals and term -“Blastula ” is used for lower animals, although both are same, the name is different due to their appearance. When scientist noticed the end structure of blastulation in case of mammals, it appeared like a cyst, so they just called it blastocyst instead of a blastula So what were the cells in the blastocyst , you remember ? There were two masses of cells :- 1)-Outer cell mass.(Trophoblast...

So in this article we will talk about “Blastulation” . Before diving into the “blastulation” , I want you to be aware of the term – “ Morula ” , most of you must be aware of “Morula” but for those who are not aware , let me give you a review of intial stages of embryo , as I will be starting Embryology from the blastulation , I will not be talking about the stages from fertilization upto morula but trust me not learning those process deeply won’t effect your Core Concept clarity regarding embryology Morula As you might be knowing that the Zygote undergo division to form more and more cells it goes from 1 to 2 cells , than divide to form 4 cells , than again divide to form 8 cells and process goes on . As you can see in below attached image. When the embryo reaches to a 16 celled stage , it forms a solid ball of cells which gives appearance like “Mulberry”, and at that stage we call that solid ball of cells surrounded with the zona pellucida as – “Morula”, see the given image below. So,...