ANATOMICAL STRUCTURES OF THE RENAL . MEDULLA 1) pars convoluta 2) renal pyramids 3) renal column 4) renal papillae square

The correct answer is 2) renal pyramids.<br /><br />The renal medulla is the innermost part of the kidney and is composed of several structures, including the renal pyramids. Renal pyramids are cone-shaped structures that contain the loops of Henle and collecting ducts, which are responsible for concentrating urine and reabsorbing water and solutes. The other options, pars convoluta, renal column, and renal papillae, are also anatomical structures found in the kidney, but they are not specifically part of the renal medulla.