A uriniferous tubule has three parts : (a) Renal corpuscle (glomerulus and Bowman's capsule),
(b) Neck and (c) 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