Describe the blood vessel called vasa rectae found in relation to uriniferous tubules. What is their function?

A uriniferous tubule has three parts : (a) Renal corpuscle (glomerulus and Bowman’s capsule),
(b) Neck and © proximal convoluted tubule, loop of Henle and distal convoluted tubule. Blood enters the glomerular capillaries through an afferent arteriole.
The efferent arteriole gives a capillary network around the tubule in the cortex. It also gives rise to some parallel, thin-walled straight capillaries called Vasa-rectae.
Function : They help to maintain reabsorbed ions and urea in the interstitial fluid and maintain osmotic pressure in the kidney