Category:Venous Pathology

Functional anatomy

Larger veins have a simailar archiecture to arteries, though thinner walled. Venules have no muscular layer. The intimal layer has no internal elastic lamina. The main distinguishing feature of veins is their posession of valves.

Developmental pathology

Arteriovenous anastamoses.

Dilation

Varicocoele: Within the pampiniform plexus of the testis. Appears like a "Bag of worms".

Other varicose veins are rarely found in domestic species.

Phlebitis

Often accompanied and preceding venous thrombosis. May be due to:

• Non-sterile venae punture.
• Umbilical lesions; omphalophlebitis.
• Bacteraemia.

Most often seen in the venae cava, jugular veins and portal veins.

Thrombosis

Spontaneous venous thrombosis is rare. Seen in cattle with traumatic reticulo-peritonitis in the caudal vena cava.

Rupture

Exercise Induced Pulmonary Haemorrhage seen in racehorses after exertion. Pulmonary vessels rupture leading to pulmonary haemorrhage.