01/10 Lecture 33 - Ureters, Bladder, & Urethra

Transitional epithelium

This is a specialised type of protective epithelium made of stratified, rounded cells that create a tissue which flattens when stretched

Rugae

These are folds that allow the bladder to expand when needed

Bladder wall

This contains muscle that allows for expulsion of urine through contraction

Trigone

This is a triangular region between the two openings of the ureter entries and one opening for the urethra

Detrusor 

These are a longitudinal, circular, and oblique fibres that contract to expel urine from the bladder into the urethra 

Internal urinary sphincter

This is a sphincter at the junction of the bladder and urethra, consistent with the detrusor muscle, and under involuntary control

External urinary sphincter

This is the sphincter where the urethra passes through the urogenital diaphragm, consistent with skeletal muscle and under voluntary control