BGDA Practical 7 - Week 7
Introduction
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Key Events of Human Development during the seventh week (week 7) following fertilization or Clinical week 9 (LMP).
(Place 7 week ultrasounds here)
- Pancreas - Week 7 to 20 pancreatic hormones secretion increases, small amount maternal insulin
- Limb
- bones form by endochondral ossification and throughout embryo replacement of cartilage with bone (week 5 onward).
- hand and foot "paddles", death (apoptosis) of cells between digits commences.
Endochondral ossification in limb
Endochondral ossification
Intramembranous ossification
Head Intramembranous ossification
Stage 18
Stage 19
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Additional Information
| Additional Information - Content shown under this heading is not part of the material covered in this class. It is provided for those students who would like to know about some concepts or current research in topics related to the current class page. |
Detailed Week by Week
The following information is a detailed timeline of embryonic development between week 3 to 8 and content does not form part of the current practical class.
Embryo Stages and Events
| Day | Stage | Event |
| Endocrine - Pancreas Development Week 7 to 20 pancreatic hormones secretion increases, small amount maternal insulin
Respiratory System Development Week 7 - enlargement of liver stops descent of heart and lungs | ||
| Stage 18 | 
Limb Bone form by endochondrial ossification and throughout embryo replacement of cartilage with bone (week 5-12). Smell vomeronasal fibres and nervus terminalis PMID 15604533 Liver obturation due to epithelial proliferation, bile ducts became reorganized, continuity between liver cells and gut PMID 9407542 Neural System Development duramater appears PMID 15478101 | |
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Liver (stage 18 to 23) biliary ductules developed in periportal connective tissue produces ductal plates that receive biliary capillaries PMID 9407542 | ||
| Stage 19 |  Neural System Development accessory olivary nucleus appears PMID 2268071
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Cite this page: Hill, M.A. (2024, April 18) Embryology BGDA Practical 7 - Week 7. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/BGDA_Practical_7_-_Week_7
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G
