Isotopes when written out are common nouns, and should begin with the uncapitalized element name, followed by a hyphen (not an em dash or en dash) and then the mass number. Examples are carbon-14 and uranium-235.
The central region of the kidney contains the renal pelvis, which is located in the renal sinus, and is continuous with the ureter. The renal pelvis is a large cavity that collects the urine as it is produced. The periphery of the renal pelvis is interrupted by cuplike projections called calyces.
RENAL SINUS-The renal sinus is the cavity within the kidney which contains the renal pyramid. Nerves and blood vessels pass into the renal sinus through the hilus. HILUS-The hilus is the slit-like opening in the middle of the concave border of the kidney.Nerves and blood vessels pass through the hilus into the renal sinus located inside.he Human Kidneys. The human kidneys contain many parts. Each part has it's own function: CAPSULE-The renal capsule is the membrane that covers the kidney. It directly covers the renal cortex, which forms the outer stratum. CORTEX-The calyx is the recess in the internal medulla of the kidney which encloses the pyramids.