Abstract
The pattern of intimal folds was studied around intercostal artery orifices in rabbit aorta by scanning electron microscopy and light microscopy. The area just proximal and distal to the orifices revealed a smooth surface lacking folds, reflected by a stretched internal elastic membrane which showed no undulation. Lateral and further proximal and distal well-preserved folds were observed. The pattern of intimal folds in this area evidently reflects the special flow conditions prevailing in and at the intercostal artery orifices.

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