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Block 1 AR > Bladder > Flashcards

Bladder Flashcards

1
Q

What is the trigone?

A

Smooth triangular region formed by ureteral orifices and urethral orifice. Stretch sensors here

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2
Q

What cell types are found in the bladder lining?

A

Transitional epithelium lining (urothelium), also found in ureters
Detrusor muscle in wall

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3
Q

What prevents urine reflux during micturition?

A

Vesico ureteric valve, thickening of detrusor muscle

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4
Q

What is reflux nephropathy?

A

Incompetent vesico ureteric valve allows reflux of urine
Dilated ureter
Irregular renal outline, clubbed calyces, cortical scars

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5
Q

What is bladder support derived from?

A

Pelvic floor, perineal membrane & ligaments
Pubo-vesical ligament (female) - attach to pubic bone
Levator ani in both sexes - moves up when contracted
Pubo-prostatic ligament (male)

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6
Q

Where does blood supply to the pelvic viscera originate from?

A

Internal iliac artery

Bladder - vesical arteries

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7
Q

Describe venous drainage from pelvic viscera

A

Vesical & prostatic plexus to internal iliac vein

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8
Q

Describe lymph drainage from the pelvic viscera

A

External & internal iliac nodes
Sacral nodes
Umbilical region - follow urachus

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9
Q

What is an alternative to catheterisation if it is not possible?

A

Supra pubic catheterisation

Doesn’t enter peritoneal cavity

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10
Q

Where is the reflex micturition centre?

A

Sacral spinal cord

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11
Q

How do autonomic nerves travel to pelvic organs?

A

Nerve plexus on posterolateral wall of pelvic cavity (inferior hypogastric)

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12
Q

What reinforces micturition?

A

Abdo wall muscles and valsava manoeuvre

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13
Q

What effect does parasympathetic activity have on the bladder?

A

Detrusor muscle contraction

Internal urethral sphincter relaxation

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14
Q

What voluntary control do we have over micturition?

A

Pudendal nerve contracts external urethral sphincter

Need to relax to urinate

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15
Q

What control does sympathetic activity have on the bladder?

A

Contract internal urethral sphincter (ejaculation and stage fright)
Detrusor muscle relaxation

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16
Q

Why are females more prone to incontinence?

A

Shorter urethra
No protection from prostate
Sphincters can be damaged from childbirth

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17
Q

What sphincters do females have?

A

Internal urethral sphincter
External urethral sphincter
Compressor urethrae
Sphincter urethrovaginalis

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18
Q

What sphincters do males have?

A

Internal urethral sphincter
External urethral sphincter
Compressor urethrae

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19
Q

What is micturition?

A

Conversion of the continuous involuntary production of urine into the intermittent, consciously controlled voiding of urine
Autonomic reflex under voluntary control
Bladder expands with little change in pressure (filling time), but after certain volume get increase in intravesical pressure
Urge to micturate (micturition reflex)

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20
Q

What is the function of the bladder?

A

Collection and low pressure storage of urine
Expansion without leaks or reflux to kidneys
No significant increase in pressure until full
Appropriate expulsion of urine

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21
Q

Describe bladder structure

A

Hollow, muscular organ
Outer connective tissue layer (Adventitia)
Lining is transitional cell epithelium (urothelium)
Specialised, multi-layered, remains intact as bladder expands
Inside appears yellow with rugae (folds), except trigone region

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22
Q

Describe the layers of the bladder wall

A

Inside: transitional cell epithelium
Lamina propria
Detrusor muscle (smooth muscle) (muscularis propria)
Outside: Adventia (connective tissue)

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23
Q

What is detrusor muscle?

A

Bands of interlaced smooth muscle with gap junctions – acts as one

24
Q

Describe the structure of the Bladder neck/ posterior urethra

A

2-3 cm long detrusor muscle +elastic tissue

25
Q

How do we prevent leakage and reflux to the kidney?

A

Vesicourethral angle: urethra passes through pelvic floor muscle at an angle from the bladder. Well toned floor maintains the angle
Sphincters: internal sphincter-detrusor muscle and elastic fibres, involuntary control (bladder neck); external sphincter, skeletal muscle, voluntary control
Angle ureters enter the bladder: Ureters enter at uppermost angles of
trigone, Enter obliquely through the detrusor and pass 1-2 cm beneath the bladder mucosa before emptying into the bladder

26
Q

What is the capacity of the bladder? And when is the 1st urge to micturate noticed?

A

Bladder capacity 300-500ml
1st urge 150-300ml
Every 3-4 hours

27
Q

Why do females have a faster urine flow rate?

A

Female: Max flow 40-50ml/s, weaker bladder neck/ sphincter
Male: Max flow 30-40ml/s, require more pressure as urethra is longer

28
Q

What happens during voiding of urine from the bladder?

A

Co-ordinated relaxation of internal sphincter & contraction of detrusor
Relaxation of external sphincter
Urethral relaxation, detrusor contraction, relaxation of sphincters, relaxation of pelvic floor muscles, funnelling of the bladder neck

29
Q

What Sacral response and conscious control is there to voiding in adults and children?

A

Children – spinal reflex, no control – nappies
Adults – learn to control external sphincter until want to urinate, higher centre stimulation of pudendal nerve, keeps external sphincter shut

30
Q

What nervous innervation controls bladder function?

A

Sympathetic - T10-L2 Relax bladder wall and contract int. sphincter Pudendal S2-S4 keeps the piss off the floor (external spincter)

31
Q

Describe the sympathetic involvement in storage of urine

A

Sympathetic nervous system predominates
alpha-adrenergic receptors at base/neck of bladder increase muscle tone
Beta-adrenergic receptors in body of bladder decrease detrusor muscle tone
Properties pharmacologically manipulated using anti-adrenergic drugs

32
Q

Describe the micturition reflex

A

Stretch receptors detect bladder filling
Parasympathetic neurons fire, smooth muscle (detrusor) contracts
Decreased sympathetic firing, internal sphincter relaxes
Decreased somatic motor neuron activity, external sphincter relaxes

33
Q

Where does conscious control of the bladder come from?

A

Stretch receptors as normal but also relay message to pontine storage centre which acts via pudendal nerve, sympathetic activity and decreased parasymp activity to contract external sphincter and prevent urination until an appropriate time

34
Q

Describe the micturition reflex when it includes conscious control

A

Stretch receptors to afferent nerves to pons
Pontine micturition centre activated
Sends impulse to pelvic splanchnic nerves and decreases activity of pudendal nerve and sympathetic nerves so relaxes sphincters

35
Q

What ganglion to sympathetic neurons to the bladder act via?

A

Inferior hypogastric ganglion

36
Q

What are potential sites for damage to the micturition pathway?

A

Cerebral lesion: involuntary co-ordinated micturition (stroke, PD, dementia)
Spinal shock: involuntary, uncoordinated, detrusor hyperflexia, (trauma, MS, spina bifida, compression by tumour)
Peripheral nerve lesion: atonic bladder (pelvic surgery, diabetesmellitus)

37
Q

What are storage lower urinary tract syndromes?

A

Incontinence, frequency, urgency, nocturia

38
Q

What are voiding lower urinary tract symptoms?

A

Poor stream, hesitancy, dysuria, intermittency, double voiding, terminal dribbling, retention

39
Q

What is transurethral resection of prostate (TURP)?

A

Surgery cutting away a section of prostate
Used to treat benign prostate hyperplasia
Can lead to retrograde ejaculation and urinary incontinence

40
Q

What is incontinence? And what sort of problems does it cause?

A 
Unintentionally passing urine (or faeces) because of loss of control of bladder (or bowel) 
Constitutes a social and health problem 
Incontinence rarely shortens lives but huge effect on Quality of Life
Most patients (cost) effectively treated at low risk
41
Q

What are age related problems with incontinence?

A

Sphincter muscles lose tone – less effective at voluntarily retaining urine
Stroke, Alzheimer’s, other CNS problems affect cerebral cortex or hypothalamus so higher control of continence affected
In males, prostate enlargement causing retention

42
Q

What are 5 types of incontinence?

A

FOCUS

Functional, overflow, continuous, urge, stress

43
Q

How can incontinence be investigated and managed?

A

History: quantify symptoms, importance to patient, charts, questionnaires
Examination: Abdomen, pelvic (genitalia), digital rectum exam
Management: Lifestyle/training, Drugs, surgery

44
Q

What are Urodynamics? And what can you measure with it?

A

Study of pressure and flow during storage, transport and expulsion of urine in the urinary tract (normally lower urinary tract)
Urine flow rate, residual urine, detrusor function measured at inflow and outflow cystometry

45
Q

What is Outflow cystoscopy?

A

Catheter through urethra into bladder, transducer in the rectum
Fill bladder with fluid and pressures recorded in bladder and rectum
Bladder pressure is combined abdominal and detrusor pressure
Rectal pressure is from abdomen, Bladder – rectum = detrusor

46
Q

What cell types are found in the bladder?

A

Transitional epithelium

Thick muscle layer

47
Q

What cell types are in the urethra?

A

Transitional epithelium

Then squamous nearer exit point

48
Q

What does the bladder develop from?

A

Anterior part of the cloaca with the allantois attached

49
Q

What is the allantois?

A

Passes from cloaca to umbilicus in development

50
Q

What problems can be caused by remnants of the allantois?

A

Urachal fistula - urine can leak out of umbilicus
Urachal cyst - lump at umbilicus
Urachal sinus - discharge cheesy smelly into umbilicus

51
Q

What nerves carry sensation above and below the pelvic pain line from the bladder?

A

T12-L2 travel with sympathetics. Above

S2-S4 travel with parasympathetics. Below

52
Q

What effect does the pudendal nerve have on the bladder?

A

Somatic = Stop (S2-4 pudendal nerve)
Contracts external urethral sphincter
Need to relax to urinate

53
Q

What effect does sympathetic stimulation have on the bladder?

A

Sympathetic = Stop (L1-2)
Contracts internal urethral sphincter (ejaculation & stage fright)
Detrusor muscle relaxation

54
Q

What effect does parasympathetic stimulation have on the bladder?

A

Parasympathetic activity (S2,3,4) = Pee
Detrusor muscle contraction
Internal urethral sphincter relaxation

55
Q

What are the 4 surfaces of the bladder?

A

Posterior
Superior
Inferolateral x2

Block 1 AR (19 decks)

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