The straight venules of kidney are branches from the plexuses at the apices of the medullary pyramids, formed by the terminations of the arteriae rectae.

They run outward in a straight course between the tubes of the medullary substance, and joining, as above stated, the interlobular veins

Interlobular veins

The venae stellatae join to form the interlobular veins, which pass inward between the rays, receive branches from the plexuses around the convoluted tubules, and, having arrived at the bases of the renal pyramids, join with the venae rectae....

, form venous arcades; these in turn unite and form veins which pass along the sides of the pyramids.

Contains fenestrated capillaries.