|
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 |
