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Individual differences |
Methods | Statistics | Clinical | Educational | Industrial | Professional items | World psychology |
Developmental Psychology: Cognitive development · Development of the self · Emotional development · Language development · Moral development · Perceptual development · Personality development · Psychosocial development · Social development · Developmental measures
The stages are delineated through the development of structures, not by size or the number of days of development, and so the chronology can vary between species, and to a certain extent between embryos. It only covers the first 60 days of development; at that point the term embryo is usually replaced with the term fetus.
It was based on work by Streeter (1942) and O'Rahilly and Müller (1987). The name "Carnegie stages" comes from the Carnegie Institute.
While the Carnegie stages provide a universal system for staging and comparing the embryonic development of most vertebrates, other systems are occasionally used for the common model organisms in developmental biology, such as the Hamburger-Hamilton stages in the chick.
Days are approximate, and reflect the days since the last ovulation before pregnancy ("Postovulatory age").
Stage 1: 1 daysEdit
Stage 2: 3 daysEdit
Stage 3: 4 daysEdit
Stage 4: 5-6 daysEdit
Stage 5 (a-c): 7-12 daysEdit
Stage 6: 13-15 daysEdit
Stage 7: 15-17 daysEdit
Stage 8: 17-19 daysEdit
Stage 9: 19-21 daysEdit
Stage 10: 21-23 daysEdit
Stage 11: 23-26 daysEdit
Stage 12: 26-30 daysEdit
- upper limb buds
Stage 13: 28-32 daysEdit
Stage 14: 31-35 daysEdit
Stage 15: 35-38 daysEdit
Stage 16: 36-42 daysEdit
Stage 17: 42-44 daysEdit
Stage 18: 44-48 daysEdit
Stage 19: 48-51 daysEdit
Stage 20: 51-53 daysEdit
Stage 21: 53-54 daysEdit
Stage 22: 54-58 daysEdit
Stage 23: 56-60 daysEdit
- Photos at unsw.edu.au
- Overview at umich.edu
- Details on stages at lsuhsc.edu
- List of structures by week, at mrc.ac.uk
|Mammalian development of embryo and development and fetus (some dates are approximate - see Carnegie stages) - edit|
Week 3: Hensen's node | Gastrula/Gastrulation | Trilaminar embryo Branchial arch (1st) | Branchial pouch | Meckel's cartilage | Somite/Somitomere | Germ layer (Ectoderm, Endoderm, Mesoderm, Chordamesoderm, Paraxial mesoderm, Intermediate mesoderm, Lateral plate mesoderm)
|Histogenesis and Organogenesis|
Circulatory system: Primitive atrium | Primitive ventricle | Bulbus cordis | Truncus arteriosus | Ostium primum | Foramen ovale | Ductus venosus | Ductus arteriosus | Aortic arches | Septum primum | Septum secundum | Cardinal veins
Urinary/Reproductive system: Urogenital folds | Urethral groove | Urogenital sinus | Kidney development (Pronephros | Mesonephros | Ureteric bud | Metanephric blastema) | Fetal genital development (Wolffian duct | Müllerian duct | Gubernaculum | Labioscrotal folds)
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