In cows branches of the ureters that extend into medulla are called?

The branches of the ureters that extend into the medulla of a cow's kidney are called renal papillae.

Here's a breakdown:

* Ureters: Tubes that carry urine from the kidneys to the bladder.

* Medulla: The inner region of the kidney, responsible for concentrating urine.

* Renal Papillae: Cone-shaped projections at the apex of the renal pyramids, where the collecting ducts of the nephrons (the functional units of the kidney) empty into the renal pelvis. The renal pelvis is the funnel-shaped structure that collects urine from the kidneys and passes it to the ureters.

So, the renal papillae are the points where the ureters connect to the kidney and receive the concentrated urine from the medulla.