Template:Human Eyelid timeline table

From Embryology
Human Embryonic Eyelid Timeline
Carnegie Stage Event
10 optic primordia appear
13 By the end of the fourth week the optic vesicle lies close to the surface ectoderm. The surface ectoderm overlying the optic vesicle, in response to this contact, has thickened to form the lense placode.
14 (about 32 days) the lens placode is indented by the lens pit.
15 (about 33 days) the lens pit is closed. The lens vesicle and optic cup lie close to the surface ectoderm and appear to press against the surface.
16 (37 days) Prior to the development of the eyelids, one small sulcus or groove forms above the eye (eyelid groove) and another below it.
17 - 19 grooves deepen, eyelid folds develop, first below, and then above, the eye.
19 - 22 eyelid folds develop into the eyelids and cover more of the eye as the palpebral fissure takes shape. The upper and the lower eyelids meet at the outer canthus in Stage 19.
20 the inner canthus is established.
23 closure of the eyelids is complete (Note - shown as still open in some Kyoto embryo).
Data - from Kyoto embryos with Carnegie staging.[1]   Links: eyelid
  1. Pearson AA. (1980). The development of the eyelids. Part I. External features. J. Anat. , 130, 33-42. PMID: 7364662