Left Eye of 26 Week Old Fetus
Computer generated image reconstructed from scanned human data. Actual
size of fetus = 360 mm. This image presents a frontal view of the left
eye of a 26-week-old fetus. The age is calculated from the day of
fertilization. The pigmented left eye is partially open. The ridge-like
markings around the eyes are the eyelids. During the 26th week of
development, the fetus gains the ability to open its eyes while alert
and close its eyes while sleeping. Eye color is usually blue,
regardless of the permanent color, as pigmentation is not fully
developed. Final formation of eye pigmentation requires exposure to
light and usually occurs a few weeks after birth.

Action Potential of Neuron