During pulpal inflammation,arterial walls collapse and the venous walls remain intact because arterial walls are thicker than the walls of veins.

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During pulpal inflammation,as with inflammation in any tissue,delivery of blood is increased.The walls of the arteries,which deliver blood,are stronger and therefore more likely to survive.Conversely,the veins,which remove blood,are quite thin and readily collapse.This results in retention of excess blood leading to increased pressure and pain.Increased pressure causes obstruction of the apical foramen,which stops blood flow and results in death of pulpal tissues.

During Pulpal Inflammation,arterial Walls Collapse and the Venous Walls Remain