Foundations Practical - Week 1 to 8: Difference between revisions
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|| Congenital abnormalities that occur during this period of organogenesis can be more serious (major) than later in fetal development. Both genetic and environmental factors can contribute to congenital abnormalities. In addition to infections, there are many environmental factors that can affect development during this period. Embryonic development is generally not "self correcting" later in the fetal period, there are also critical periods of development form different systems at specific times during this embryonic period. | || Congenital abnormalities that occur during this period of organogenesis can be more serious (major) than later in fetal development. Both genetic and environmental factors can contribute to congenital abnormalities. In addition to infections, there are many environmental factors that can affect development during this period. Embryonic development is generally not "self correcting" later in the fetal period, there are also critical periods of development form different systems at specific times during this embryonic period. | ||
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Revision as of 11:36, 31 March 2019
Foundations Practical: Introduction | Week 1 and 2 | Week 3 and 4 | Week 1 to 8 | Week 9 to 36 | Neonatal | Critical Periods | Additional Resources | Quiz
The Embryonic Period
- Development of Organs and Tissues
You have now been through the earliest stages of embryonic development. From the original simple trilaminar embryo all the organs and tissues will now begin to develop, details of these processes require more time than we currently have available. What we will now look at are the changes in the external embryo appearance during this period.
Historically the embryonic period was also divided into 23 stages (I do not expect students to identify embryo stages).
Week: | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
Carnegie stage: | 1 2 3 4 | 5 6 | 7 8 9 | 10 11 12 13 | 14 15 | 16 17 | 18 19 | 20 21 22 23 |
Key features to note are:
- changes in overall size (CRL)
- surface bulges that reflect organ development
- development of the upper and lower limbs
- development of the head
This page is about getting an overview of the external changes that occur during the embryonic period. In order to observe and understand the internal changes occuring in organ development is beyond the scope of this current practical.
Changes in Overall Size
In the first 8 weeks the embryo grows from 0.1 mm to about 3 cm in length.
During this time the embryo size is also measured from "crown" to "rump" or the Crown Rump Length (CRL).
Surface Bulges Reflect Organ Development
Surface of the Stage 13 Embryo showing surface features reflecting surface and internal development. Carnegie stage 13
Week 8 - End of Embryonic Period | |||||||||||
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Placentation
During this period the parts of the conceptus not contributing to the embryo will contribute the fetal component of the placenta and the embryonic/fetal membranes.
This topic will also be covered in detail in BGD.
Timeline Overview
Human Timeline |
Page | Play |
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. |
Take the Quiz
Open the table below, select your answers, click submit, then reopen the table to see your result.
Quiz - Week 1 to 8 |
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TermsNote - linked terms in the list below are external resources to the current class content.
Foundations Practical: Introduction | Week 1 and 2 | Week 3 and 4 | Week 1 to 8 | Week 9 to 36 | Neonatal | Critical Periods | Additional Resources | Quiz
Cite this page: Hill, M.A. (2024, April 23) Embryology Foundations Practical - Week 1 to 8. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Foundations_Practical_-_Week_1_to_8
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