Stages of the embryos, fetuses, children, and adults analyzed by immunohistochemistry
. | Developmental age, d . | No. of somites . | Length, mm . | No. of specimens . | No. and type of tissues . |
|---|---|---|---|---|---|
| Embryos, Carnegie stage | |||||
| 16 | 0 | 2 | 2 YS | ||
| 10 | 22-23 | 4-12 | 2.5 | 3 | 3 YS, 2 PV |
| 11 | 24-25 | 13-20 | 2.5 | 1 | 1 E, 1 YS, 1 PV |
| 12 | 26-27 | 21-29 | 4 | 3 | 2 E, 1 YS, 3 PV |
| 13 | 28-30 | 30-35 | 4.5 | 3 | 1 E, 1 YS, 3 PV |
| 14 | 31-32 | —* | 4 | 2 | 2 E, 1 YS, 2 PV |
| 16 | 38-40 | — | 6-8 | 1 | 1 E, 1 YS, 1 PV |
| 17 | 41-43 | — | 11-12 | 2 | 1 E, 1 YS, 1 PV |
| 19 | 48-49 | — | 15-17 | 1 | 1 E, 1 PV |
| 20 | 50-51 | — | 18-23 | 1 | 1 E, 1 PV |
| Fetuses, by age | |||||
| 13 wk | — | — | — | 1 | L, S, BM |
| 15 wk | — | — | — | 1 | L, S, BM |
| 16 wk | — | — | — | 1 | L, S, BM |
| 26 wk | — | — | — | 1 | L, S, BM |
| 34 wk | — | — | — | 1 | L, S, BM |
| Children, by age | |||||
| 2 y | — | — | — | 1 | BM |
| 5 y | — | — | — | 1 | BM |
| Adult, by age | |||||
| 40 y | — | — | — | 1 | BM |
| 67 y | — | — | — | 1 | BM |
| 82 y | — | — | — | 1 | BM |
. | Developmental age, d . | No. of somites . | Length, mm . | No. of specimens . | No. and type of tissues . |
|---|---|---|---|---|---|
| Embryos, Carnegie stage | |||||
| 16 | 0 | 2 | 2 YS | ||
| 10 | 22-23 | 4-12 | 2.5 | 3 | 3 YS, 2 PV |
| 11 | 24-25 | 13-20 | 2.5 | 1 | 1 E, 1 YS, 1 PV |
| 12 | 26-27 | 21-29 | 4 | 3 | 2 E, 1 YS, 3 PV |
| 13 | 28-30 | 30-35 | 4.5 | 3 | 1 E, 1 YS, 3 PV |
| 14 | 31-32 | —* | 4 | 2 | 2 E, 1 YS, 2 PV |
| 16 | 38-40 | — | 6-8 | 1 | 1 E, 1 YS, 1 PV |
| 17 | 41-43 | — | 11-12 | 2 | 1 E, 1 YS, 1 PV |
| 19 | 48-49 | — | 15-17 | 1 | 1 E, 1 PV |
| 20 | 50-51 | — | 18-23 | 1 | 1 E, 1 PV |
| Fetuses, by age | |||||
| 13 wk | — | — | — | 1 | L, S, BM |
| 15 wk | — | — | — | 1 | L, S, BM |
| 16 wk | — | — | — | 1 | L, S, BM |
| 26 wk | — | — | — | 1 | L, S, BM |
| 34 wk | — | — | — | 1 | L, S, BM |
| Children, by age | |||||
| 2 y | — | — | — | 1 | BM |
| 5 y | — | — | — | 1 | BM |
| Adult, by age | |||||
| 40 y | — | — | — | 1 | BM |
| 67 y | — | — | — | 1 | BM |
| 82 y | — | — | — | 1 | BM |
PV indicates placental villi; E, embryo; —, not determined (for fetuses, children, and adults, only one tissue sample per type of tissue was studied); L, liver; S, spleen; and BM, bone marrow.
From this stage, the number of somites is difficult to determine and thus is not useful criterion.