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| [[File:Day 0 one cell stage.jpg|100px|Embryo at Day 0]][[File:Day 1 dividing egg.JPG|100px|Day 1]][[File:Day 2 morula.JPG|100px|Day 2]][[File:Day 3 Advanced Segmentation.JPG|100px|Day 3]][[File:Day 4 Blastocyst.JPG|100px|Day 4]][[File:Day 4.5 Implantation.JPG|100px|Day 4.5]][[File:Day 5 Formation of Egg Cylinder.JPG|100px|Day 5]][[File:Day 6 Differentiation of Egg Cylinder.JPG|100px|Day 6]][[File:Day 6.5 Advanced Endometrial Reaction.JPG|100px|Day 6.5]][[File:Day 7 Amnion.JPG|100px|Day 7]][[File:Day 7.5 Neural plate, presomite stage.JPG|100px|Day 7.5]][[File:Day 8 First Somites.JPG|100px|Day 8]][[File:Day 8.5 Turning of embryo.JPG|100px|Day 8.5]][[File:Day 9 Formation and closure of anterior neuropore.JPG|100px|Day 9]][[File:Day 9.5 Formation of posterior neuropore and forelimb bud.JPG|100px|Day 9.5]][[File:Day 10.5 Deep Lens Indentation.JPG|100px|Day 10.5]][[File:Day 11 Closure of lens vesicle.JPG|100px|Day 11]][[File:Day 11.5 Lens Vesicle completely separated from surface.JPG|100px|Day 11.5]][[File:Day 12 Earliest signs of fingers.JPG|100px|Day 12]][[File:Day 13 Anterior Footplate Indented, marked pinna.JPG|100px|Day 13]][[File:Day 14 Fingers Separate.JPG|100px|Day 14]][[File:Day 15 toes separate.JPG|100px|Day 15]][[File:Day 16 Reposition of umbilical hernia.JPG|100px|Day 16]][[File:Day 17 fingers and toes joined together.JPG|100px|day 17]][[File:Day 18 long whiskers.JPG|100px|Day 18]][[file:Day 19 Newborn Mouse.JPG|100px|Day 19]]
| | <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 |
| The above illustrations highlight what can be observed in the mouse embyro throughout its development. The progress from Day 0 (top left) to Day 19 (bottom right).
| | 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 0''' One Cell Egg
| | 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 1''' Dividing cells. Cleavage of cells has begun. Day ends with 4 cells present
| | 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 2''' Formation of Morula
| | 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 3''' Advanced Segmentation. 16-25 cells within same sized morula.
| | 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 4''' Blastocyst 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 4 ½''' Implantation and invasion into the uterine epithelium
| | 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. |
| * '''Day 5''' Formation of the egg cylinder occurs.
| | 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 6''' Differentiation of Egg Cylinder
| | 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 |
| * '''Days 6 ½''' Advanced Endodermal Reaction
| | 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 7''' Amnion formation
| | 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 7 ½''' Neural Plate, Presomite Stage
| | 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 8''' First somite formation. Day ends with 1 - 7 somites present
| | 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 8 ½''' Rotation of the Embryo. 8 - 12 somites present
| | </gallery> |
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| * '''Day 9''' Formation and Closure of the anterior neuropore. 13 - 20 somites present in the embryo
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| * '''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.
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| * '''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.
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| * '''Day 10 ½''' Deep lens indentation occurs. There are 35-30 somites present and the embryo is now 3.5-4.9mm.
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| * '''Day 11''' The lens vesicle closes. There are 40-44 somites present and the embryo has reached 5-6mm in length.
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| * '''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
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| * '''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.
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| * '''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.
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| * '''Day 14''' The fingers begin to separate distally. The embryo has 56 - 66 somites and is 11-12mm in length.
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| * '''Day 15''' The toes separate. at this stage, the embryo is 12 - 144m from crown to rump.
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| * '''Day 16''' The umbilical hernia is repositioned. The fetus now measures between 14 and 17 mm.
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| * '''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.
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| * '''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.
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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.
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