Cardiovascular System - Carnegie Stage 22
|The individual serial slices have also been incorporated into a 3D model of this embryo.
The cardiovascular system extends throughout the entire embryo.
|C6L||L and R common carotid arteries. L and R internal jugular veins.|
|C7L||L brachiocephalic vein (transverse anastomosis of L, R jugular veins). L common carotid artery. Brachiocephalic trunk.|
|D1L||Aortic arch. Thymus (retrosternal). Trachea. Oesophagus. Large L and R jugular veins.|
|D2L||Aortic arch. L jugular lymph sac lying laterally with hemiazygos joining it. Trachea. Oesophagus. Draining of azygos vein into R jugular vein.|
|D3L||Ascending aorta attached cranial to transverse pericardial sinus. Superior vena cava expanding into R jugular vein. Trachea (bifurcation). Oesophagus. Azygos (R) and hemiazygos (L) veins.|
|D4L||Ascending aorta. Pulmonary trunk and arteries. Thoracic aorta. Oesophagus. Bronchi. Note azygos vein on right, and precursor of hemiazygos vein on left side.
(Image excerpt different scale from previous images)
|D5L||Superior vena cava. Ascending arch of aorta. Pulmonary trunk with the other two semilunar valves.
Sinus above one valve and branching of pulmonary trunk into L and R pulmonary arteries.
|D6L||Superior vena cava. Ascending aorta with transverse pericardial sinus behind. Semilunar valve at origin of pulmonary trunk. L. atrium and auricle. Thoracic aorta.|
|D7L||R atrium with R venous valve. R ventricle close to origin of pulmonary trunk. L.ventricular wall and three semilunar valves of aortic ostium.|
|E1L||Section through all four chambers of heart.
left ventricle- outflow tract close to origin of ascending aorta. Deep coronary sulcus and transverse pericardial sinus.
right atrium- R venous valve of the inferior vena cava, the small septum secundum, the aperture in the dorsal part of septum primum (ostium secundum). (The foramen ovale arises later with the elongation of the septum secundum).
left atrium- entrance of the L and R pulmonary veins and the auricle.
|E2L||Section through all four chambers of heart.
Ventricles. Right venous valve. Between the tiny ridge of the septum secundum of the R atrium and the R venous valve.
right atrium- drainage of the inferior vena cava (cf. E3). R atrioventricular canal. Septum primum.
left atrium- drainage sites of R and L pulmonary veins.
|E3L||Section through all four chambers of heart.
Ventricles. Diaphragm and liver. Pericardium and cavity. R atrium and two cusps of the atrioventricular valve. L atrium and its auricle. Thoracic aorta. Inferior vena cava. Coronary sinus.
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Cite this page: Hill, M.A. (2020, January 23) Embryology Cardiovascular System - Carnegie Stage 22. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Cardiovascular_System_-_Carnegie_Stage_22
- © Dr Mark Hill 2020, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G