Here's the breakdown:

* Major Calyces: These are large, funnel-shaped structures within the kidney that collect urine from the minor calyces.

* Renal Columns: These are extensions of the renal cortex that project down between the renal pyramids. They contain blood vessels and nerves but are not directly involved in urine collection.

Therefore, major calyces are not branches of the renal columns.

Think of it this way:

* Renal pyramids: The "cones" where urine is formed.

* Minor calyces: Small cups that collect urine from each pyramid.

* Major calyces: Larger cups that collect urine from several minor calyces.

* Renal pelvis: The funnel-shaped structure that collects urine from the major calyces and passes it to the ureter.

* Renal columns: "Bridges" of cortical tissue between the pyramids, not directly involved in urine collection.