Embryo No.
|
Length in mm
|
Arches present
|
Characteristic features
|
1878
|
1201
|
391
|
470
|
2053
|
1201b
|
836
|
Just before establishment of fourth arch; estimated average length 4 mm; 31st day of development
|
826
|
1075
|
588
|
873
|
988
|
1380
|
2841
|
Just before completion of pulmonary arch; estimated average length 6 mm; 36th day of development
|
810
|
1354
|
617
|
792
|
1121
|
721
|
163
|
Time of interruption of pulmonary arch and branchial period; estimated average length 12 mm; 45th day of development
|
1771
|
544
|
940
|
1909
|
492
|
74
|
End of period of rapid descent of heart and arteries; estimated average length 18 mm; 50th day of development
|
1390
|
460
|
2937
|
886
|
Estimates based on Keibel F. and Mall FP. Manual of Human Embryology II. (1912) J. B. Lippincott Company, Philadelphia. curve of length and age.
|
Reference: Congdon ED. Transformation of the aortic-arch system during the development of the human embryo. (1922) Contrib. Embryol., Carnegie Inst. Wash. Publ 277, 14:47-110.
|