The primary externally recognisable feature is the progressive
closure of the lens vesicle. The somites in the cervical region
are no longer visible and the rapid growth of the brain is striking.
The nasal pits start to form.
Absent: auditory hillocks, anterior footplate.
11 dpc (range 10.5-11.25)
40-44 somite pairs>
Witschi Stage 25-26 (rat)
All scale bars in microns.
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