Carnegie stage 1
From Embryology
Facts: Week 1, size 0.1-0.15 mm
Features: zygote, fertilized oocyte, pronuclei, polar bodies, zona pellucida
This image shows an early human zygote where the male and female pronuclei have not yet combined to form the single zygote nucleus.
Two of the egg's polar bodies (right, 3 o'clock position) are shown at the edge of the egg cytoplasm. These polar bodies contain the excess DNA from the meiotic divisions of the egg.
The zona pellucida
Additional Images
- Carnegie Stages: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | About Stages | Timeline
Cite this page: Hill, M.A. (2024, April 25) Embryology Carnegie stage 1. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Carnegie_stage_1
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G