Provide definitions/explanations for the following terms:
$(1)$ Calyces
$(2)$ Renal pyramids

(N/A) $(1)$ Calyces: These are cup-like extensions or projections of the renal pelvis that collect urine from the renal papillae.
$(2)$ Renal pyramids: These are cone-shaped structures found in the renal medulla of the kidney,which contain the loops of Henle and collecting ducts.