Stage 3: Lab Manual - Horizon III Free Blastocyst
- 0.1 - 0.2 mm in diameter.
- The trophoblastic cells that form the walls of the cavity multiply more rapidly than the embryonic cells of the inner cell mass.
- The zona begins to disappear.
- Ovulation age: 4 - 5 days.
Developmental Stages in Human Embryos by Ronan O'Rahilly and Fabiola Müller.
Published by Carnegie Institution of Washington, Publication 637. 1987.
Stage 3 (PDF 71 KB)
QUESTION: Which type of cells multiply most rapidly?