What surrounds the glomerulus in the kidney?

The glomerulus, a network of capillaries in the kidney, is surrounded by Bowman's capsule, which is a double-walled structure that encases the glomerulus. This structure plays a crucial role in the process of filtration, where blood plasma is filtered into the renal tubule. Bowman's capsule collects the filtrate that is produced by the glomerulus and channels it into the proximal convoluted tubule for further processing.

While the other structures mentioned have important functions in the kidney, they do not surround the glomerulus. The ureter transports urine from the kidney to the bladder, the proximal convoluted tubule is involved in reabsorption of substances from the filtrate, and the renal pelvis is the funnel for urine flowing into the ureter. Thus, Bowman's capsule is the direct and anatomical structure that encapsulates the glomerulus, making it the correct answer.