Urinary System

• Organs

– Kidney

– Ureters

– Urinary Bladder

– Urethra

• Functions of the Urinary System

– Regulation of internal environment composition

– Excretion of certain waste products

• Kidney

– Capsule

– Cortex

– Medulla

• Pyramids

• Columns

– Calyces

– Pelvis

• Functional Unit of Kidney:

– Nephron

• Ureter

– from the renal pelvis to the urinary bladder

– retroperitoneal

– lined with transitional epithelium

– longitudinal and circular smooth muscle layers

• Urinary bladder

– lined with transitional epithelium

– lining thrown into rugae

– within bladder wall: the detrusor muscle

– trigone: funnels urine into urethra

• Urethra

– from urinary bladder to outside

– lined with stratified epithelium

• Path of Urine Flow

• Urethral Sphincters

– Internal: smooth muscle

– External: skeletal muscle

• Micturition