Study of Blastula Stages in Mammals

Materials required

Permanent slide of T.S. of blastula, compound microscope. 


The Procedure

Real lab Procedure

  • Observe the slide under lower magnification of the microscope.
  • Note the feature of blastula. 


Simulator Procedure

  • Drag and drop the slide onto the stage of the compound microscope.
  • Click on the eyepiece of the compound microscope to view the sample.
  • To observe each part, you can mouse over the image, each part will zoom in.
  • To label the image, click on zoomed part of image.
  • Drag and drop the correct labels to appropriate places.
  • Drag the correct part from the list of cells and drop it in the correct place to form a complete image of sample shown.
  • You can repeat the experiment by clicking on the ‘Reset’ button.
  • If you have any doubts, you can click on the help button that provides hints.



  • In transverse section, the blastula appears as a sphere with a cavity, called blastocoel.
  • The cells in the blastula arrange themselves in two layers: the inner cell mass, and an outer layer called the trophoblast.