Category:Carnegie Stage 20

From Embryology

This Embryology category shows pages and media related to Carnegie stage 20 embryonic development in week 8, 51 - 53 days, GA week 10. The embryos have a crown rump length (CRL) of 18 - 22 mm. This page also shows specific embryo examples in various collections.


There is also a specific Carnegie stage 20 resource page. See also Carnegie Stage 20 - Events


Stage 20 Links: Week 8 | System Development | Lecture - Limb | Lecture - Head Development | Lecture - Sensory | Science Practical - Head | Science Practical - Sensory | Science Practical - Urogenital | Historic - Skull Development | Carnegie Embryos | Category:Carnegie Stage 20 | Next Stage 21
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Carnegie Collection - Stage 20 
Serial No. Size (mm) Grade Fixative Embedding Medium Plane Thinness (µm) Stain Point Score Sex Year Notes
240 E, 20 Ch, 50x40x30 Poor Formol P Coronal 20 Iron H. 27 d 19??
256 E, 21 poor Alc p Sagittal 25 Coch. 23 M 1904 Tubal. Partial anencephaly
353 E, 20 Poor Alc P Sagittal 20 H. & Congo red 22,5 M 1906
431 E, 19 Ch, 30x25x25 Good Formol P Sagittal 20 H. & Congo red 25,5 M 1908 Tubal
437 E, 23 Ch., 80x60x50 Poor Formol P Sagittal 50 Coch 24 M 193?
453 E, 23 Ch, 60x40x30 Poor Formol P Sagittal 20 H. & Congo red 23-5  ? 1910 Injected
460 E, 21 Exc. Bichlor. acetic P Transverse 40 (Stain - Haematoxylin Eosin), coch, 24.5 M 1910 injected
462 E, 20 Ch, 50x40x30 Exc. Formol P Transverse 40 Al, coch 23.5 F 1910
635B E, 22 Poor Ale P Trans 50 Al, coch 26.5 M 1913
657 E, 25 Ch, 35x20x15 Poor Formol C Sagittal 40 Al, coch 26.5 M 1913 Tubal
966 E, 23 Ch, 51x38x13 Exc Bichlor. acetic P Coronal 40 (Stain - Haematoxylin Eosin), aur, or. G 25 M 1911 Tubal
1134B E, 23 Poor Formol p Sagittal 100 Al. coch., 22 - 1915
1266 E, 23.1 Poor Formol C-P Sagittal 25 Al. coch., (Stain - Haematoxylin Eosin) aur, or G 20.5 F 191?
2393 Ch, 61.5x50x35 Poor
3527 E., 22 Ch. 32x30x10 Good Formol P Sagittal 25 Al. coch., 28  ? 1921
4059 E, 21.6 Good Formol P Coronal 15 Al. coch., Mallory 29.5 $ 1922
4148 E, 21 Ch. 45x34x30 Good Formol p Coronal 15 A1. coch., Mallory 19  ? 1922
4361 E, 22 Ch., 52x42x23 poor Formol 9 Transverse 20 Coch. 24 8 1923
6202 E, 21 Ch., 35x35x22 Exc Bouin P Sagittal 20 (Stain - Haematoxylin Eosin) 20.5 8 1930 Tubal
6426 E 21.5 Good Formol C—P Transverse 20 (Stain - Haematoxylin Eosin) 21 3 1931
7274 E, 18.5 Ch., 48x44x35 Exc Bouin C—P Transverse 20 (Stain - Haematoxylin Eosin), phlox. 20 M 1936
7906 E19.5 Exc Bouin C—P Coronal 20 (Stain - Haematoxylin Eosin) 22 8 1941 Left renal agenesis
8517 E., 20.8 Exc. Bouin C—P Coronal 20 (Stain - Haematoxylin Eosin) 24 8 1943
8226 E, 18.0 Exc. Bouin C—P Sagittal 10 Alan  ? 3 1944
Abbreviations
  • Size - E. is the greatest length of the embryo and Ch. is the mean diameter of the chorion.
  • Grade - total grade of the specimen and includes both its original quality and the condition of the mounted sections.
  • Embedding medium - paraffin (P) or a combination of celloidin and paraffin (C-P).
  • Fixative - formalin (Formol), alcohol and formalin (Alc, formol), Bouin (Bouin solution)
  • Stain -
  •  ? - unknown or not determined.

Carnegie Collection

Carnegie Collection - Stage 20 
Serial No. Size (mm) Grade Fixative Embedding Medium Plane Thinness (µm) Stain Point Score Sex Year Notes
240 E, 20 Ch, 50x40x30 Poor Formol P Cor. 20 Iron H. 27 d 19??
256 E, 21 poor A1c p Sag. 25 Coch. 23 M 1904 Tubal. Partial anencephaly
353 E, 20 Poor A1c P Sag. 20 H. & Congo red 22,5 M 1906
431 E, 19 Ch, 30x25x25 Good Formol P Sag. 20 H. & Congo red 25,5 M 1908 Tubal
437 E, 23 Ch., 80x60x50 Poor Formol P Sag. 50 Coch 24 M 193?
453 E, 23 Ch, 60x40x30 Poor Formol P Sag. 20 H. & Congo red 23-5  ? 1910 Injected
460 E, 21 Exc. Bichlor. acetic P Trans. 40 H.&E., coch, 24.5 M 1910 injected
462 E, 20 Ch, 50x40x30 Exc. Formol P Trans. 40 Al, coch 23.5 F 1910
635B E, 22 Poor Ale P Trans 50 Al, coch 26.5 M 1913
657 E, 25 Ch, 35x20x15 Poor Formol C Sag 40 Al, coch 26.5 M 1913 Tubal
966 E, 23 Ch, 51x38x13 Exc Bichlor. acetic P Cor 40 H.&E, aur, or. G 25 M 1911 Tubal
1134B E, 23 Poor Formol p Sag 100 Al. coch., 22 - 1915
1266 E, 23.1 Poor Formol C-P Sag. 25 Al. coch., H&E aur, or G 20.5 F 191?
2393 Ch, 61.5x50x35 Poor
3527 E., 22 Ch. 32x30x10 Good Formol P Sag. 25 Al. coch., 28  ? 1921
4059 E, 21.6 Good Formol P Cor. 15 Al. coch., Mallory 29.5 $ 1922
4148 E, 21 Ch. 45x34x30 Good Formol p Con 15 A1. coch., Mallory 19  ? 1922
4361 E, 22 Ch., 52x42x23 poor Formol 9 Trans. 20 Coch. 24 8 1923
6202 E, 21 Ch., 35x35x22 Exc Bouin P Sag. 20 H.&E 20.5 8 1930 Tubal
6426 E 21.5 Good Formol C—P Trans. 20 H&E - 21 3 1931
7274 E, 18.5 Ch., 48x44x35 Exc Bouin C—P Trans. 20 H.&E., phlox. 20 M 1936
7906 E19.5 Exc Bouin C—P Cor. 20 H.&E. 22 8 1941 Left renal agenesis
8517 E., 20.8 Exc. Bouin C—P Cor. 20 H.&E. 24 8 1943
8226 E, 18.0 Exc. Bouin C—P Sag 10 Alan  ? 3 1944
Abbreviations
  • Size - E. is the greatest length of the embryo and Ch. is the mean diameter of the chorion.
  • Grade - total grade of the specimen and includes both its original quality and the condition of the mounted sections.
  • Embedding medium - paraffin (P) or a combination of celloidin and paraffin (C-P).
  • Fixative - formalin (Formol), alcohol and formalin (Alc, formol), Bouin (Bouin solution)
  • Stain -
  •  ? - unknown or not determined.

Blechschmidt Collection

Embryo 130758

Hill Collection

Homo32 Links: chorionic vesicle | embryo | drawing | Carnegie stage 20

Media in category ‘Carnegie Stage 20’

The following 93 files are in this category, out of 93 total.