Clinical Anatomy of the European Hamster 
The impression of the right heart {impressio 
cardiaca dextra) appears on the medial surface 
{fades medialis) of the right cranial and middle 
lobes. The right atrium of the heart is embedded 
within this impression. Cranial to the cardiac im- 
pression, there is a flat, sagittal groove {sulcus venae 
cavae) in which the cranial vena cava runs. The 
root of the lung lies upon the medial surface, dorsal 
to the right atrium and the end of the caudal vena 
cava. Out of the right pulmonary lobe, a branch of 
the pulmonary vein comes directly adjacent to the 
right stem bronchus. The right branch of the pul- 
monary artery branches dorsal to the bronchus and 
extends to the individual pulmonary lobes. 
The hilus of the right lung conveys the following 
efferent and afferent vessels: cranially, the bron- 
chial opening and the right branch of the pulmonary 
vein lie juxtaposed. Caudodorsal to these is the 
point of entry of the right branch of the pulmonary 
artery. The diaphragmatic surface ijacies diaphrag- 
matica) is formed by the medial edge of the right 
middle and right diaphragmatic lobes. The dia- 
phragmatic surface of the right accessory lobe 
covers the largest part of the diaphragm and, there- 
fore, conforms to the shape of the diaphragmatic 
arch (Figs. 4-17, 4-19). At the dorsal side of the 
right accessory lobe, a flat, sagittal groove-shaped 
depression extends in which the caudal vena cava is 
found. The intermediate accessory lobe is indented 
dorsally by the esophagus and ventrally by the cau- 
dal vena cava. The edges of the lungs are variously 
shaped, depending on their positions in relation to 
other organs. Whereas the sternal margin and the 
diaphragmatic margin are more sharply edged, the 
dorsal margin covered by the vertebral column is 
dull and in part even flattened as a result of the 
pressure applied by the esophagus. 
In the cranial half of the medial surface of the left 
and intermediate lobes, the cardiac impression is 
found (Figs. 4-17, 4-19). The left impression is 
definitely larger than the right in that the greater 
part of the left ventricle and the cardiac apex is ap- 
plied on the left. The cardiac apex is invested ven- 
trally by the right accessory lobe. By forming the 
left cardiac impression, a sharp edge is produced on 
the right accessory lobe between the medial surface 
and the diaphragmatic surface. Similarly, a sharp 
edge is formed between the medial surface and the 
costal surface of the left lobe. The surface of the 
right accessory lobe, which lies adjacent to the left 
lobe, forms another sharp edge along its diaphrag- 
matic surface. 
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