Template:Congdon1922 table1

Embryo No.	Length in mm	Arches present	Characteristic features
1878	1.3	1	slightly plexiform. Presomite stage
1201	2	1
391	2	1	7 somites
470	4	1	neuropore open; 14 to 16 somites
2053	3	1, 2 beginning	Anterior neuropore closed; 20 somites; transverse anastomoses between primitive aortae
1201b	3	1, 2
836	4	2, 3
Just before establishment of fourth arch; estimated average length 4 mm; 31st day of development
826	5	3, 4
1075	6	3, 4
588	4	3, 4
873	6	3, 4
988	6	3, 4
1380	4	3, 4; pulmonary arches almost complete
2841	4	3, 4; one so-called fifth arch; pulmonary almost complete
Just before completion of pulmonary arch; estimated average length 6 mm; 36th day of development
810	5	3, 4, and pulmonary arches
1354	6	3, 4, and pulmonary arches
617	7	3, 4, two so-called fifth arches, and pulmonary arches
792	8	3, 4, and pulmonary arches
1121	11	3, 4, and pulmonary arches
721	9	3, 4, and pulmonary arches
163	9	3, 4, and pulmonary arches
Time of interruption of pulmonary arch and branchial period; estimated average length 12 mm; 45th day of development
1771	13	3, 4, left pulmonary and remnant of right pulmonary arch
544	10
940	14
1909	15
492	16
74	16
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.

Congdon (1922) Table 1

Embryo No. Length in mm Arches present Characteristic features 1878 1.3 1 slightly plexiform. Presomite stage 1201 2 1 391 2 1 7 somites 470 4 1 neuropore open; 14 to 16 somites 2053 3 1, 2 beginning Anterior neuropore closed; 20 somites; transverse anastomoses between primitive aortae 1201b 3 1, 2 836 4 2, 3   Just before establishment of fourth arch; estimated average length 4 mm; 31st day of development 826 5 3, 4 1075 6 3, 4 588 4 3, 4 873 6 3, 4 988 6 3, 4 1380 4 3, 4; pulmonary arches almost complete 2841 4 3, 4; one so-called fifth arch; pulmonary almost complete   Just before completion of pulmonary arch; estimated average length 6 mm; 36th day of development 810 5 3, 4, and pulmonary arches 1354 6 3, 4, and pulmonary arches 617 7 3, 4, two so-called fifth arches, and pulmonary arches 792 8 3, 4, and pulmonary arches 1121 11 3, 4, and pulmonary arches 721 9 3, 4, and pulmonary arches 163 9 3, 4, and pulmonary arches   Time of interruption of pulmonary arch and branchial period; estimated average length 12 mm; 45th day of development 1771 13 3, 4, left pulmonary and remnant of right pulmonary arch 544 10 940 14 1909 15 492 16 74 16   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.