Micturition Flashcards
- What is the definition of micturition
the periodic discharge of urine from the bladder through the urethra
- what is micturition intiated by?
it is initiated by voluntary relaxation of the sphincter muscle below the bladder
- What maintains micturition
maintained by reflex contraction of the muscles of the bladder
where does urine produced by the kidneys drain into
Drains into urinary bladder via ureters on both sides of body
how much volume does the adult bladder hold?
500ml
what does the internal urethral sphincter guard?
internal urethral sphincter guards outlet to urethra
what is the external urethral sphincter responsible for?
External sphincter (aka external urethral sphincter) responsible for voluntary control
why is female urethra shorter than male urethra
Male urethra travels through penile shaft therefore female urethra is shorter
- What type of organ is the Urinary bladder
hollow organ
- What forms the BODY of the urinary bladder
– formed by detrusor muscle
- What forms the NECK of the urinary bladder?
trigone in its posterior aspect
- What guards the emptying of the bladder?
internal and external sphincters
- What type of muscle is the internal sphincter made of
completely involuntary ( smooth muscle)
- What type of muscle is the external sphincter made of
voluntary. ( skeletal muscle)
- What muscle is responsible for emptying of the bladder
Detrusor muscle
- What is the advantage of the urinary tract being made up of stratified Squamous epithelium
It allows stretching of the bladder
- What nerve fibres supply the urinary bladder and the internal sphincter
supplied by sympathetic and
parasympathetic nerve fibres
- What vertebral levels is the sympathetic supply found and what is the nerve called
- L1/L2
- Hypogastric nerve
- What nerve fibres supply the external sphincter
supplied by somatic nerve fibres
called the Pudendal nerve