BGDA Practical Placenta - Placental Functions: Difference between revisions

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==Exchange==
==Exchange==
[[File:Placenta_oxygen_exchange_levels.jpg]]
[[File:Placenta_oxygen_exchange_levels.jpg]]
[[File:Placental_volume_graph.jpg|thumb|400px|Human term placental volumes sorted by size (from table).]]
Term placental composition, villous capillarization and the mean cross-sectional areas of peripheral villi and capillaries, data from a study sample of 15 normal placenta (mean placental volume, 652 ml). <ref><pubmed>19141109</pubmed></ref>
{|
|-bgcolor="CEDFF2"
| width="150px"|'''Variable'''
| '''Unit'''
| '''Placenta''' (mean, n = 15)
|-
|Intervillous space
| mL
| 213
|-bgcolor="F5FAFF"
| Stem villi
| mL
| 71.4
|-
| Peripheral villi
| mL
| 326
|-bgcolor="F5FAFF"
| Trophoblast
| mL
| 95.5
|-
| Stroma
| mL
| 184
|-bgcolor="F5FAFF"
| Fetal capillaries
| mL
| 46.9
|-
| Non-parenchyma
| mL
| 41.5
|-bgcolor="F5FAFF"
| Peripheral villi
| km
| 89.2
|-
| Fetal capillaries
| km
| 310
|-bgcolor="F5FAFF"
| TS area villi
| µm<sup>2</sup>
| 3700
|-
| TS area capillary
| µm<sup>2</sup>
| 150
|-bgcolor="F5FAFF"
| Capillaries
| mL mL<sup>-1</sup>
| 0.147
|-
| Length ratio
| km km<sup>-1</sup>
| 3.6
|-bgcolor="F5FAFF"
|}
<references/>


==Endocrine==
==Endocrine==

Revision as of 19:24, 29 May 2012

BGDsmall.jpg
Practical 14: Implantation and Early Placentation | Villi Development | Maternal Decidua | Cord Development | Placental Functions | Diagnostic Techniques | Abnormalities


Exchange

Placenta oxygen exchange levels.jpg

Endocrine

Protein and steroid hormones.

  • Human chorionic gonadotrophin (hCG) - like leutenizing hormone, supports corpus luteum in ovary, pregnant state rather than menstrual, maternal urine in some pregnancy testing
  • Human chorionic somatommotropin (hCS) - or placental lactogen stimulate (maternal) mammary development
    • rise through pregnancy, stimulates maternal metabolic processes, breast growth
  • Human chorionic thyrotropin (hCT)
  • Human chorionic corticotropin (hCACTH)
  • Relaxin
  • Steroid Hormones - progesterone (maintains pregnancy), estrogens (fetal adrenal/placenta)


Terms

BGDsmall.jpg

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Cite this page: Hill, M.A. (2024, April 19) Embryology BGDA Practical Placenta - Placental Functions. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/BGDA_Practical_Placenta_-_Placental_Functions

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