File:Stage18 bf10.jpg
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Human Embryo Carnegie Stage 18
- Embryo Week 7, 44 - 48 days, 13 - 17 mm
- The image shows the intact gestational sac (25-30 mm diameter) with chorionic villi (white finger-like extensions) covering the chorionic membrane surface.
- The chorion surface is now divided into 2 halves:
chorion laeve
(laeve = smooth) The smooth chorion found on conceptus away from maternal blood supply (towards uterine epithelium and cavity) with very few villi present.
chorion frondosum
(frondosum = leafy) the chorion found on conceptus oriented towards maternal blood supply where the majority of villi form and proliferate, will contribute the fetal component of the future placenta.
- Stage 18 Links: Embryo in gestational sac | Embryo open sac | Embryo 2 and gestational sac | Embryo 2 | Carnegie stage 18
Image: Dr Steven O'Connor (Houston, Texas) - Other embryo images.
Cite this page: Hill, M.A. (2024, April 16) Embryology Stage18 bf10.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Stage18_bf10.jpg
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 11:48, 12 August 2011 | | 1,200 × 897 (151 KB) | S8600021 (talk | contribs) | ==Human Embryo Carnegie Stage 18== Facts: Week 7, 44 - 48 days, 13 - 17 mm View: Lateral view. Amniotic membrane intact. Features: pigmented eye, eyelid, nasolacrimal groove, external acoustic meatus, heart, digital rays, liver prominance, thigh, ankle |
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