Appendix 2
The Development of the Unborn Child's Body

 

Eyes

 

Timing

Source
The developing eye appears.
Day 22 Sadler, p 394
The primordia of the eyes are present. Day 23 after fertilization Moore, p 5
The lens placode is present. Day 28 Sadler, p 90
The lens placode ( the primordium of the lens) is present. Day 28 after fertilization Moore, p 92
The eye anlage is present. Day 28 after fertilization Sadler, front pages
The eyes begin their development. Early in the 4th week Larsen, p 252
The development of the eye is first evident. Beginning of the 4th week after fertilization Moore, p 492
The lens pits and optic cups are forming. Day 30 after fertilization Moore, p 5
Melanin first appears in the cells of the developing pigment retina. Days 33 after fertilization Larsen, p 257
Pigment can be seen in the retina. Days 37-40 after fertilization Moore, p 91
The eye muscles begin to form. Day 38 after conception Rugh, p 47
The eyes become pigmented. Day 40 after conception Rugh, p 47
The eye is obvious, reflecting the fact that the retinal pigment has formed. 6th week after fertilization Moore, p 94
The eye is obvious. About day 42 after fertilization Moore, p 99
The pigmented eye is developing. About 42 days after fertilization Moore, p 99
The nerve cells of the retina form. Day 44 after conception Rugh, p 50
Pigmentation of the retina can be seen. Days 43-49 of development Sadler, p 110
The eyes are developing rapidly. 7th week after conception Rugh, p 52
The nerve connections from the retina to the brain are established. Day 48 after conception Rugh, p 51

The eye is heavily pigmented.
About 52 days after fertilization Moore, p 100
The eyes are closing or closed. 9th week after fertilization Moore, p 109; Williams, p 155
Slow eye movements occur. 14th week after fertilization Moore, p 112
Rapid eye movements begin. 21st week after fertilization Moore, p 114
"Blink-startle" responses have been reported. 22nd-23rd weeks after fertilization Moore, p 114
The eyes are open. 26th week after fertilization Moore, p 114


 


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