12
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8
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1-7
- Equivalent Witschi Stage in rat = 14-15
- Equivalent Carnegie Stage in humans = 9
Theiler Stage 13
- Embryonic age = 8.5 dpc (range 8-9.25 dpc)
- 8-12 somite pairs
- Equivalent Witschi Stage in rat = 15
- Equivalent Carnegie Stage in humans = 10
Theiler Stage 14
- Embryonic age = 9 dpc (range 8.5-9.75 dpc)
- 13-20 somite pairs
- Equivalent Witschi Stage in rat = 16
- Equivalent Carnegie Stage in humans = 11
Theiler Stage 15
- Embryonic age = 9.5 dpc (range 9-10.25 dpc)
- 21-29 somite pairs
- Equivalent Witschi Stage in rat = 17-19
- Equivalent Carnegie Stage in humans = 12
Theiler Stage 16
- Embryonic age = 10 dpc (range 9.5-10.75 dpc)
- 30-34 somite pairs
- Equivalent Witschi Stage in rat = 20-21
- Equivalent Carnegie Stage in humans = 13-15
Theiler Stage 17
- Embryonic age = 10.5 dpc (range 10-11.25 dpc)
- 35-39 somite pairs
- Equivalent Witschi Stage in rat = 24-25
- Equivalent Carnegie Stage in humans = 13-15
Theiler Stage 18
- Embryonic age = 11 dpc (range 10.5-11.25 dpc)
- 40-44 somite pairs
- Equivalent Witschi Stage in rat = 25-26
- Equivalent Carnegie Stage in humans = 13-15
Theiler Stage 19
- Embryonic age = 11.5 dpc (range 11-12.25 dpc)
- 45-47 somite pairs
- Equivalent Witschi Stage in rat = 26-27
- Equivalent Carnegie Stage in humans = 16
Theiler Stage 20
- Embryonic age = 12 dpc (range 11.5-13 dpc)
- 48-51 somite pairs
- Equivalent Witschi Stage in rat = 28
- Equivalent Carnegie Stage in humans = 17
Theiler Stage 21
- Embryonic age = 13 dpc (range 12.5-14)
- 52-55 somite pairs
- Equivalent Witschi Stage in rat = 29-30
- Equivalent Carnegie Stage in humans = 18-19
Theiler Stage 22
- Embryonic age = 14 dpc (range 13.5-15 dpc)
- 56-60 somite pairs
- Equivalent Witschi Stage in rat = 31
- Equivalent Carnegie Stage in humans = 20-23
Theiler Stage 23
Toes separate
- The 'toes' separate and are clearly divergent, not becoming parallel until later.
- Hair follicles are present in the cephalic region but not at the periphery of the vibrissae.
- The pinna covers more than half of the external auditory meatus and the eyelids are still open.
- Absent: nail primordia, 'fingers' 2-5 parallel.
- Embryonic age = 15 dpc
- >60 somite pairs
- Equivalent Witschi Stage in rat = 32
- Human fetal period.
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