File:Placental volume graph.jpg
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Term Placenta Measurements
Morphometric indices at term of placental composition, villous capillarization and the mean cross-sectional areas of peripheral villi and capillaries.
| Variable | Unit | Placenta |
| Intervillous space | mL | 213 |
| Stem villi | mL | 71.4 |
| Peripheral villi | mL | 326 |
| Trophoblast | mL | 95.5 |
| Stroma | mL | 184 |
| Fetal capillaries | mL | 46.9 |
| Non-parenchyma | mL | 41.5 |
| Peripheral villi | km | 89.2 |
| Fetal capillaries | km | 310 |
| TS area villi | µm2 | 3700 |
| TS area capillary | µm2 | 150 |
| Capillaries | mL mL-1 | 0.147 |
| Length ratio | km km-1 | 3.6 |
(data from a study sample of 15 normal placenta, mean placental volume, 652 ml).[1][2]
Data
- Microscopical fields on stained sections were selected by systematic uniform random sampling and analysed stereologically to estimate the volumes of placental compartments and total lengths of villi and fetal capillaries.
- Mean cross-sectional areas of peripheral villi and capillaries, together with measures of villous capillarization (capillary volume densities and capillary : villus length ratios), were derived from global volumes and lengths.
Reference
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