File talk:Congdon-table01.jpg
From Embryology
Table 1. Showing correlation of size of embryos and development of the aortic-arch system. | |||||||
---|---|---|---|---|---|---|---|
Embryo No. | Length in mm. | Arches present. | Characteristic features. | ||||
(Time of establishment of first arch; estimated average length 1.3 mm.; 23d day of development) | 1878 | 1.3 | I | Slightly plexiform. Presomite stage | |||
1201 | 2 | I | |||||
391 | 2 | I | 7 somites | ||||
470 | 4 | I | Neuropores open; 14 to 16 somites | ||||
2053 | 3 | I; II beginning | Anterior neuropore closed; 20 somites; transverse anastomoses between primitive aortae | ||||
Template:CE1201b | 3 | I. II | Earlier mandibular aitery; paired longitudinal neural arteries; | ||||
836 | 4 | II, III | no ventral tract on cord | ||||
(Just before establishment of fourth arch; estimated average length 4 mm.; 31st day of development) | |||||||
826 | 5 | III, IV | Earlier mandibular and hyoid arteries | ||||
1075 | 6 | III, IV | Subclavian | ||||
588 | 4 | III, IV | Earlier mandibular and hyoid arteries | ||||
873 | 6 | III, IV | Ventral arterial tract on cord | ||||
988 | 6 | III, IV | |||||
1380 | 4 | III, IV, pulmonary arches almost complete | |||||
2841 | 4 | III, IV; one so-called fifth arch; pulmonary almost complete | Early formation of basilar artery | ||||
(Just before completion of pulmonary arch; estimated average length 6 mm.; 36th day of development) | |||||||
810 | 5 | III, IV, and pulmonary arches | Late stage in formation of basilar artery, Splitting of aortic sac distinct. Unpaired aorta complete | ||||
1354 | 6 | III, IV, and pulmonaiy arches | |||||
617 | 7 | III, IV, two so-called fifth arches, and pulmonary arches | Subclavian artery surrounded by brachial plexus. Splitting of sac well marked. Islands at end of basilar artery | ||||
792 | 8 | III, IV, and pulmonary arches | Pulmonary and IV arches widely separated below | ||||
1121 | 11 | III, IV, and pulmonary arches | Right pulmonary artery small; basilar rounded; IV and pulmonary still farther apart | ||||
721 | 9 | III, IV, and pulmonary arches | Cervical segmental arteries becoming interrupted | ||||
163 | 9 | III, IV, and pulmonary arches | Anastomoses of cervical segmental arteries to form the vertebral artery are nearly complete | ||||
(Time of interruption of pulmonary arch and of branchial period; estimated average length 12 mm 45th day of development) | |||||||
1771 | 13 | III, IV, left pulmonary and remnant of right pulmonary arch | |||||
544 | 10 | Vertebral artery complete; identity of arches disappearing; beginning of period of rapid descent of heart and arteries | |||||
940 | 14 | Definitive aortic arch just taking form. Right dorsal aorta between III and IV interrupted. Remnants still distinguishable. Main pulmonary channel from heart to aorta nearly straight | |||||
1909 | 15 | Common carotid elongated | |||||
492 | 16 | Right dorsal aorta distal to IV patent but slender | |||||
Template:CE74 | 16 | End of period of descent. Definitive aortic arch has curve of large radius. Short segment of right dorsal aorta distal to subclavian drawn out in slender thread | |||||
End of period of rapid descent of heart and arteries; estimated average length 18 mm.; 50th day of development) | |||||||
1390 | 18 | Definitive aortic arch sharply bent | |||||
460 | 20 | Summit of definitive aortic arch at superior thoracic aperture | |||||
2937 | 24 | Sternal bands in contact through most of their length | |||||
886 | 43 | Origin of right and left pulmonaiy" branches in contact through most of their length | |||||
Estimates based on Mall's (1912) curve of length and age. |