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* '''Day 0'''   One Cell Egg
<gallery caption="Development of the Mouse Embryo" widths="175px" heights="175px" perrow="5">
 
File:Day 0 one cell stage.jpg|'''Day 0''' One Cell Egg  
* '''Day 1'''   Dividing cells. Cleavage of cells has begun. Day ends with 4 cells present
File:Day 1 dividing egg.JPG|'''Day 1''' Dividing Egg. Cleavage of cells has begun. The Day ends with 4 cells present.
 
File:Day 2 morula.JPG|'''Day 2''' Morula
* '''Day 2'''   Formation of Morula  
File:Day 3 Advanced Segmentation.JPG|'''Day 3''' Advanced segmentation of the Morula. 16-25 cells within same sized morula.
 
File:Day 4 Blastocyst.JPG|'''Day 4''' Blastocyst formation
* '''Day 3'''   Advanced Segmentation. 16-25 cells within same sized morula.  
File:Day 4.5 Implantation.JPG|'''Day 4.5''' Implantation and Invasion of the blastocyst into the uterine epithelium
 
File:Day 5 Formation of Egg Cylinder.JPG|'''Day 5''' Formation of the egg cylinder
* '''Day 4'''   Blastocyst formation
File:Day 6 Differentiation of Egg Cylinder.JPG|'''Day 6''' Differentiation of the egg cylinder
 
File:Day 6.5 Advanced Endometrial Reaction.JPG|'''Day 6.5''' Gastrulation starts during the period of Advanced Endometrial Reaction  
* '''Day 4 ½'''   Implantation and invasion into the uterine epithelium
File:Day 7 Amnion.JPG|'''Day 7''' Amnion formation
 
File:Day 7.5 Neural plate, presomite stage.JPG|'''Day 7.5''' Neural plate and presomite stage
* '''Day 5'''   Embryoblast and trophoblast formation.  
File:Day 8 First Somites.JPG|'''Day 8''' Formation of the first seven somites.  
 
File:Day 8.5 Turning of embryo.JPG|'''Day 8.5''' Rotation of the embryo. The embryo now has between 8 and 12 somites.
* '''Day 6''' Differentiation of Egg Cylinder
File:Day 9 Formation and closure of anterior neuropore.JPG|'''Day 9''' Formation and closure of the anterior neuropore. There are 13 - 20 somites present in the embryo  
 
File:Day 9.5 Formation of posterior neuropore and forelimb bud.JPG|'''Day 9.5''' Formation of the posterior neuropore and forelimb bud. There are 21 to 29 somites present and the embryo measures 1.8 - 3.3 mm in length.
* '''Days 6 ½'''   Advanced Endodermal Reaction  
file:Day 10 Closure of posterior neuropore, hind limb bud and tail bud.JPG|'''Day 10''' The posterior neuropore closes and formation of the hind limb bud and tail bud occurs. there are 30 - 34 somites present and the embryo is 3.1 - 3.9mm  
 
File:Day 10.5 Deep Lens Indentation.JPG|'''Day 10.5''' Deep eye lens indentation occurs. There are 35-30 somites present and the embryo is now 3.5-4.9mm.
* '''Day 7'''   Amnion formation
File:Day 11 Closure of lens vesicle.JPG|'''Day 11''' Closure of the lens vesicle. There are 40-44 somites present and the embryo has reached 5-6mm in length.
 
File:Day 11.5 Lens Vesicle completely separated from surface.JPG|'''Day 11.5''' The lens vesicle is completely separated from the surface epithelium. There are currently 45 - 47 somites and the embryo reaches a length of 6 - 7mm
* '''Day 7 ½'''   Neural Plate, Presomite Stage
File:Day 12 Earliest signs of fingers.JPG|'''Day 12''' First signs of fingers. The embryo is 7 - 9mm in length from crown to rump and there are 48 - 51 somites.  
 
File:Day 13 Anterior Footplate Indented, marked pinna.JPG|'''Day 13''' The anterior footplate becomes indented and the external ear structure is more defined. The embryo is now 9 - 11mm in length and has 52 - 55 somites.  
* '''Day 8'''   First somite formation. Day ends with 1 - 7 somites present
File:Day 14 Fingers Separate.JPG|'''Day 14''' The fingers separate. The embryo has 56 - 66 somites and is 11-12mm in length.
 
File:Day 15 toes separate.JPG|'''Day 15''' The toes separate. At this stage the embryo is 12 - 14.4m from crown to rump
* '''Day 8 ½'''   Rotation of the Embryo. 8 - 12 somites present 
File:Day 16 Reposition of umbilical hernia.JPG|'''Day 16''' The umbilical hernia is repositioned. The fetus now measures between 14 and 17 mm.
 
File:Day 17 fingers and toes joined together.JPG|'''Day 17''' The fingers and toes become joined 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 9'''   Formation and Closure of the anterior neuropore. 13 - 20 somites present in the embryo  
File:Day 18 long whiskers.JPG|'''Day 18''' Whiskers elongate. The length of the embryo varies between 18 and 23 mm due to the degree of curvature of the fetus.
 
File:Day 19 Newborn Mouse.JPG|'''Day 19''' The newborn mouse is between 23 and 27mm depending on the degree of flexure of the body axis
* '''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.
</gallery>
 
* '''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.
 
[[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]]

Latest revision as of 19:32, 14 October 2009