File:Human-critical periods of development.jpg: Difference between revisions

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Critical Periods of Human Development

Dark Orange = major abnormality | Light Orange = minor abnormality

The table above identifies approximate windows of time, "critical periods", that following exposure to teratogens can lead to developmental abnormalities (anomalies, congenital).

In general, the effects for each system are more severe (major anomalies) in the embryonic period during organogenesis in the first trimester.

Later teratogen exposure are less severe (minor anomalies) in the fetal period during continued growth and differentiation in the second and third trimester.

This figure is also available on Human Abnormal Development as a formatted table below.

Critical Periods of Human Development

Conceptus

Embryonic development (weeks)

Fetal period (weeks)

1

2

3

4

5

6

7

8

9

16

20-36

38

Neural

Heart

Upper limbs

Lower limbs

Ear

Eye

Palate

Teeth

External genitalia

Loss

Major abnormalities

Functional and Minor abnormalities

Cite this page: Hill, M.A. (2024, April 18) Embryology Human-critical periods of development.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Human-critical_periods_of_development.jpg

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 Later teratogen exposure are less severe (minor anomalies) in the fetal period during continued growth and differentiation in the second and third trimester.
-This figure is also available as a [[Human_Abnormal_Development#Critical_Periods|formatted table]].
+This figure is also available on [[Human Abnormal Development]] as a [[Human_Abnormal_Development#Critical_Periods|formatted table]] below.
 |}
+{{Critical Periods table}}
-:'''Links:''' [[Abnormal_Development_-_Teratogens#Critical_Periods_of_Development|Table version]] | [[Human Abnormal Development]] | [[Abnormal_Development_-_Teratogens|Teratogens]] | [[:File:Thalidomide external effects timeline.jpg|Thalidomide external effects timeline]] | [[Prenatal Diagnosis]] [[:Category:Timeline|Category:Timeline]]
+<br>
+:'''Links:''' {{Critical period}} | [[Abnormal_Development_-_Teratogens#Critical_Periods_of_Development|Table version]] | [[Human Abnormal Development]] | [[Abnormal_Development_-_Teratogens|Teratogens]] | [[:File:Thalidomide external effects timeline.jpg|Thalidomide external effects timeline]] | [[Prenatal Diagnosis]] [[:Category:Timeline|Category:Timeline]]