Carnegie stage 3

Introduction

• Human blastocyst (day 5) still within zone pellucida.

Human Blastocyst "hatching" from zona pellucida (classified as Carnegie stage 3). Blastocyst is too the right of image and zona pellucida is shown to the left of the image. Note: small opening in the zona pellucida through which the blastocyst is hatching flattened trophoblast cells forming the outer cell layer of the blastocyst inner cell mass shown in the centre of the image and on the left-hand wall of the blastocyst blastocoel forming a large fluid-filled space within the blastocyst

Facts: Week 1, 4 - 5 days, size 0.1-0.2 mm

Features: zona pellucida, trophoblast shell, inner cell mass, blastoceol

Links: Lecture | Practical | Implantation | Week 1

Carnegie Collection

58 cell blastocyst (day 4)	107 cell blastocyst (day 4.5)

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 26) Embryology Carnegie stage 3. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Carnegie_stage_3

What Links Here?

© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G