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From Embryology
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* '''Day 0'''  One Cell Egg
* '''Day 0'''  One Cell Egg [[File:Day 0 one cell stage.jpg|thumb|100px|right|Embryo at Day 0]]


* '''Day 1'''  Dividing cells. Cleavage of cells has begun. Day ends with 4 cells present
* '''Day 1'''  Dividing cells. Cleavage of cells has begun. Day ends with 4 cells present [[File:Day 1 dividing egg.JPG|thumb|100px|right|Day 1]]


* '''Day 2'''  Formation of Morula  
* '''Day 2'''  Formation of Morula  
[[File:Day 2 morula.JPG|thumb|100px|right|Day 2]]


* '''Day 3'''    Advanced Segmentation. 16-25 cells within same sized morula.  
* '''Day 3'''    Advanced Segmentation. 16-25 cells within same sized morula. [[File:Day 3 Advanced Segmentation.JPG|thumb|100px|right|Day 3]]


* '''Day 4'''    Blastocyst formation
* '''Day 4'''    Blastocyst formation [[File:Day 4 blastocyst.JPG|thumb|100px|right Day 4]]


* '''Day 4 ½'''  Implantation and invasion into the uterine epithelium
* '''Day 4 ½'''  Implantation and invasion into the uterine epithelium
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* '''Day 19'''  The Newborn mouse is between 23 and 27 mm due to varying degrees of flexure of the body axis.
* '''Day 19'''  The Newborn mouse is between 23 and 27 mm due to varying degrees of flexure of the body axis.
[[File:Day 0 one cell stage.jpg|thumb|100px|left|Embryo at Day 0]][[File:Day 1 dividing egg.JPG|thumb|100px|center|Day 1]][[File:Day 2 morula.JPG|thumb|100px|right|Day 2]]

Revision as of 22:21, 14 September 2009

  • Day 0 One Cell Egg
    Embryo at Day 0
  • Day 1 Dividing cells. Cleavage of cells has begun. Day ends with 4 cells present
    Day 1
  • Day 2 Formation of Morula
Day 2
  • Day 3 Advanced Segmentation. 16-25 cells within same sized morula.
    Day 3
  • Day 4 ½ Implantation and invasion into the uterine epithelium
  • Day 5 Embryoblast and trophoblast formation.
  • Day 6 Differentiation of Egg Cylinder
  • Days 6 ½ Advanced Endodermal Reaction
  • Day 7 Amnion formation
  • Day 7 ½ Neural Plate, Presomite Stage
  • Day 8 First somite formation. Day ends with 1 - 7 somites present
  • Day 8 ½ Rotation of the Embryo. 8 - 12 somites present
  • Day 9 Formation and Closure of the anterior neuropore. 13 - 20 somites present in the embryo
  • Day 9 ½ Formation of the posterior neuropore and forelimb bud. There are 21 - 29 somites present. The embryo is 1.8 - 3.3 mm.
  • Day 10 Closure of the posterior neuropore and hind limb bud and tail bud formation occurs. 30-34 somites present and the embryo is 3.1-3.9mm.
  • Day 10 ½ Deep lens indentation occurs. There are 35-30 somites present and the embryo is now 3.5-4.9mm.
  • Day 11 The lens vesicle closes. There are 40-44 somites present and the embryo has reached 5-6mm in length.
  • Day 11 ½ The lens vesicle is now completely spearated from the surface of the embryo. There are currently 45 - 47 somites and the embryo reaches a length of 6 - 7mm
  • Day 12 Features the earliest signs of fingers forming. The embryo is 7 - 9mm in length from crown to rump and there are 48 - 51 somites.
  • Day 13 The footplate becomes indented with the early toe structures. The pinna (external ear) development occurs rapidly. The embryo is now 9 - 11mm in length and has 52 - 55 somites.
  • Day 14 The fingers begin to separate distally. The embryo has 56 - 66 somites and is 11-12mm in length.
  • Day 15 The toes separate. at this stage, the embryo is 12 - 144m from crown to rump.
  • Day 16 The umbilical hernia is repositioned. The fetus now measures between 14 and 17 mm.
  • Day 17 The Fingers and Toes align and join together. The skin is wrinkled and thickened and the umbilical hernia has disappeared. The fetus measures 16.5 - 20mm depending on the degree of curvature.
  • Day 18 The whiskers have increased in length dramatically. The length of the embryo varies between 18 and 23 mm due to the degree of curvature of the fetus.
  • Day 19 The Newborn mouse is between 23 and 27 mm due to varying degrees of flexure of the body axis.