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Ontology Definition: TS22

Theiler Stage 22 - Fingers separate distally


Individual fingers are visible in the anterior footplate and there are deep indentations between the toes which are not yet separated. The long bones of the limbs are present and there are hair follicles in the pectoral, pelvic and trunk regions. The pinna is turned forwards and the umbilical hernia is conspicuous.

Absent: hair follicles in the cephalic region.


14 dpc (range 13.5-15)
56-~60 somite pairs

Witschi Stage 31 (rat - stage table)
Carnegie - Stage 20 , Stage 21 , Stage 22 , Stage 23 , (human - stage table)
Virtual Human Embryo - Stage 20 , Stage 21 , Stage 22 , Stage 23

All scale bars in microns

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