2009 Group Project 4

From Embryology
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MOUSE

Timeline of Development

Staging

Table 1: Mouse embryonic stages of development from fertilization to zona free blastocyst (Stages 1 to 5)
Theiler Stage Embryonic Age in Days Post Coitum (dpc) Stage Characteristic Cell Characteristics Zona Pellucida Location
1 0-0.9

(range 0-0.25)

One-celled embryo (fertilized) One cell Present
2 1

(range 1-2.5)

Dividing egg 2-4 cells

- 1st cleavage after 24hrs

Present
3 2

(range 1-3.5)

Morula (early to fully compacted) 4-16 cells Present Oviduct. Usually near utero-tubal junction.
4 3

(range 2-4)

Change from Morula to Blastocyst

-Intra-cellular matrix present -Blastocoelic cavity evident

16-40 compacted cells

-Inner cell mass -Outer layer of trophectoderm cells

Present Uterine lumen
5 4

(range 3-5.5)

Zona free Blastocyst Absent Uterine lumen

History of Model Use

Genetics

Current Embryology Research

ANAT2341 group projects

Project 1 - Rabbit | Project 2 - Fly | Project 3 - Zebrafish | Group Project 4 - Mouse | Project 5 - Frog | Students Page | Animal Development