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E4:
L ventricle. Diaphragm and liver. Oseophagus.
Thoracic aorta. Inferior venacava.
E3:
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.
E2:
Ventricles. Right venous valve. Between the tiny
ridge of the septum secundum of the R atrium and
the R venous valve, note the inferior vena cava
(cf. E3) draining into the right atrium. R
atrioventricular canal. Septum primum. In left
atrium, note the drainage sites of R and L
pulmonary veins.
E1:
Ventricles. In the R atrium, note the 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).
In the L atrium note the entrance of the L and R
pulmonary veins and the auricle. In L ventricle,
note outflow tract close to origin of ascending
aorta. Deep coronary sulcus and transverse
pericardial sinus.
D7:
R atrium with R venous valve. R ventricle close to
origin of pulmonary trunk. L.ventricular wall and
three semilunar valves of aortic ostium.
D6:
Superior vena cava. Ascending aorta with transverse
pericardial sinus behind. Semilunar valve at origin
of pulmonary trunk. L. atrium and auricle. Thoracic
aorta.
D5:
Superior vena cava. Ascending arch of aorta.
Pulmonary trunk with the other two semilunar
valves. Note sinus above one valve and branching of
pulmonary trunk into L and R pulmonary
arteries.
D4:
Ascending aorta. Pulmonary trunk and arteries.
Thoracic aorta. Oesophagus. Bronchi. Note azygos
vein on right, and precursor of hemiazygos vein on
left side.
D3:
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.
D2:
Aortic arch. L jugular lymph sac lying laterally
with hemiazygos joining it. Trachea. Oesophagus.
Draining of azygos vein into R jugular vein.
Dl:
Aortic arch. Thymus (retrosternal). Trachea.
Oesophagus. Large L and R jugular veins.
C7:
L brachiocephalic vein (transverse anastomosis of
L, R jugular veins). L common carotid artery.
Brachiocephalic trunk.
C6:
L and R common carotid arteries. L and R internal
jugular veins.
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