Template:Frog Cornea Timeline table: Difference between revisions
From Embryology
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|+ '''Frog Cornea Timeline''' | |+ '''Frog Cornea Timeline''' | ||
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! Stage | ! Stage | ||
! Event | ! Event | ||
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| stage 25 | | stage 25 | ||
| cornea starts from a simple embryonic epidermis overlying developing optic vesicle | | cornea starts from a simple embryonic epidermis overlying developing optic vesicle | ||
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| stage 30 | | stage 30 | ||
| detachment of lens placode, cranial {{neural crest}} cells start to invade the space between the lens and the embryonic epidermis to construct the corneal endothelium. | | detachment of lens placode, cranial {{neural crest}} cells start to invade the space between the lens and the embryonic epidermis to construct the corneal endothelium. | ||
| Line 13: | Line 13: | ||
| stage 41 | | stage 41 | ||
| second wave of migratory cells containing presumptive keratocytes invades the matrix, leading to formation of inner cornea and outer cornea. A unique cell mass (stroma attracting center) connects the two layers like the center pole of a tent. | | second wave of migratory cells containing presumptive keratocytes invades the matrix, leading to formation of inner cornea and outer cornea. A unique cell mass (stroma attracting center) connects the two layers like the center pole of a tent. | ||
|- | |-bgcolor="F5FAFF" | ||
| stage 48 | | stage 48 | ||
| secondary stromal keratocytes individually migrate to the center and form the stroma layer. | | secondary stromal keratocytes individually migrate to the center and form the stroma layer. | ||
| Line 19: | Line 19: | ||
| stage 60 | | stage 60 | ||
| stroma space is filled by collagen lamellae and keratocytes, and the stroma attracting center disappears. At early metamorphosis, embryonic epithelium gradually changes to adult corneal epithelium, covered by microvilli. | | stroma space is filled by collagen lamellae and keratocytes, and the stroma attracting center disappears. At early metamorphosis, embryonic epithelium gradually changes to adult corneal epithelium, covered by microvilli. | ||
|- | |-bgcolor="F5FAFF" | ||
| stage 62 | | stage 62 | ||
| embryonic epithelium thickens and cell death is observed in the epithelium, coinciding with eyelid opening. | | embryonic epithelium thickens and cell death is observed in the epithelium, coinciding with eyelid opening. | ||
| Line 25: | Line 25: | ||
| After metamorphosis | | After metamorphosis | ||
| cornea has attained the adult structure of three cellular layers, epithelium, stroma, and endothelium, and between the cellular layers lie two acellular layers (Bowman's layer and Descemet's membrane) | | cornea has attained the adult structure of three cellular layers, epithelium, stroma, and endothelium, and between the cellular layers lie two acellular layers (Bowman's layer and Descemet's membrane) | ||
|- | |-bgcolor="F5FAFF" | ||
| Table data{{#pmid:23896054|PMID23896054}} | {{frog}} | {{vision}} | | Table data{{#pmid:23896054|PMID23896054}} | {{frog}} | {{vision}} | ||
|}<noinclude>[[Category:Template]][[Category:Timeline]][[Category:Frog]][[Category:Vision]]</noinclude> | |}<noinclude>[[Category:Template]][[Category:Timeline]][[Category:Frog]][[Category:Vision]]</noinclude> | ||
Revision as of 10:50, 17 April 2018
| Stage | Event |
|---|---|
| stage 25 | cornea starts from a simple embryonic epidermis overlying developing optic vesicle |
| stage 30 | detachment of lens placode, cranial neural crest cells start to invade the space between the lens and the embryonic epidermis to construct the corneal endothelium. |
| stage 41 | second wave of migratory cells containing presumptive keratocytes invades the matrix, leading to formation of inner cornea and outer cornea. A unique cell mass (stroma attracting center) connects the two layers like the center pole of a tent. |
| stage 48 | secondary stromal keratocytes individually migrate to the center and form the stroma layer. |
| stage 60 | stroma space is filled by collagen lamellae and keratocytes, and the stroma attracting center disappears. At early metamorphosis, embryonic epithelium gradually changes to adult corneal epithelium, covered by microvilli. |
| stage 62 | embryonic epithelium thickens and cell death is observed in the epithelium, coinciding with eyelid opening. |
| After metamorphosis | cornea has attained the adult structure of three cellular layers, epithelium, stroma, and endothelium, and between the cellular layers lie two acellular layers (Bowman's layer and Descemet's membrane) |
| frog | vision |
