The Lower Urinary Tract Flashcards
Once urine leaves the medulla and enters the minor calyx is it modified anymore?
- no

Once urine leaves the medulla and enters the minor calyx it does not get modified anymore, which means that the epithelial tract are impermeable to H2O and electrolyes. What type of epithelial cells line the walls of the urinary tract?
- transitional epithelium
- a type of stratified epithelium
- these cells contract and expand in order to adapt to the degree of distension needed
Once urine leaves the medulla and enters the minor calyx it does not get modified anymore, which means that the epithelial tract are impermeable to H2O and electrolyes. Transitional epithelium, a type of stratified epithelium line the urinary tract and are able to contract and expand in order to adapt to the degree of distension needed. Why are these cells also good if there is a blockage in the kidney?
- they are able to distent and dilate
- accomadates the back up of urne

Once urine leaves the medulla and enters the minor calyx it does not get modified anymore, which means that the epithelial tract are impermeable to H2O and electrolyes. Transitional epithelium, a type of stratified epithelium line the urinary tract and are able to contract and expand in order to adapt to the degree of distension needed. The cells in the renal pelvis then stretch causing dilation and distention to accomadates the back up of urne. This stretch then causes what?
- triggers peristaltic contractions starting at the hilum
- aims to move out of renal pelvic, down ureter and towards the bladder

When urine needs to move down the ureters, there are peristaltic contractions, also known as (vermiculation) similar to GI tract. What are the orientations of smooth muscle that facilitate the process of peristaltic contractions in the ureters?
-
- longitudinal and circular smooth muscle
- create successive peristaltic waves

When urine needs to move down the ureters, there are peristaltic contractions, also known as (vermiculation) similar to GI tract. SUccessive peristaltic waves from longitudinal and circular smooth muscle faciliate the movement of urine. How do curcular and longitudinal muscles work together?
- longitudinal muscle contracts first followed by circular muscle relaxation
- longitudinal muscle then starts to relax allowing a bolus to form followed by circular muscle contraction which pushes against the bolus

In ureters there is a mucosal layer that is lined by transitional epithelium, which impermeable to H2O and electrolytes. What is this mucosa supported by?
- inner longitudinal muscles (L)
- outer circular/spiral muscle (C)
- extra outer layer of longitudinal muscle

When urine needs to be moved through the ureters to the bladder dilation of renal pelvis generates action potential from hilar pacemaker cells. The number of action potentials can be acted on by the autonomic nervous system. What do the parasympathetic and sympathetic nervous system do to the number of action potentials for peristalsis?
- parasympathetic = enhances action potentials
- sympathetic = inhibits action potentials
Does the bladder attach to the anterior or posterior abdominal wall?
- posterior
What is the name of where the ureters enter the bladder and is this a two way junction or one way junction for urine direction?
- vesico-ureteric junction
- small flaps of mucosa cover these openings and act as valves that allow urine to enter the bladder but prevent it from leaving

Where is the fundus and neck of the bladder?
- fundus = the body of the bladder
- neck = where the urether leaves the bladder

What is the name of the outer muscle layer of the bladder and does it have the same muscle origentation all the way around?
- called Detrusor Muscle layer
- composed of longitudinal and circular muscles
What type of cell lines the inner mucosa of the bladder and why?
- transitional epithelial cells
- these cells can be folder up to reduce the bladder size, creating rugae
- allow for dilation and stretching

There is a triangle shape that is formed from the openings of ureters and entrance to urethra. What is this called?
- trigone

There is a triangle shape that is formed from the openings of ureters and entrance to urethra called the trigone. What are the 2 main functions of the trigone?
1 - acts as a funnel
2 - contains stretch receptors. Once stretched past a certain degress they signal the need to pass urine
What is the rough capacity of the bladder and how is it activated to release?
- 1L
- parasympatheitc activity stiumlates contraction of the bladder to release urine
To ensure control of the bladder and its urine content there are 2 urethal sphincters. What are these called working from inside to outside the bladder?
1 -internal urethral sphincter
2 - external uretheral sphincter

To ensure control of the bladder and its urine content there are 2 urethal sphincters, the internal and external uretheral sphincters. What is the composition and role of the internal uretheral sphincter?
- band of smooth muscle (detrusor) muscle
- normal tone keeps neck of bladder and urethra free of urine

To ensure control of the bladder and its urine content there are 2 urethal sphincters, the internal and external uretheral sphincters. What is the composition and role of the external uretheral sphincter?
- composed of circular band of skeletal muscle where urethra passes through urogenital diaphragm
- acts as a valve with resting muscle tone
- voluntary relaxation permits micturition (action of urinating)

To ensure control of the bladder and its urine content there are 2 urethal sphincters, the internal and external uretheral sphincters. Out of the internal and external uretheral sphincter, which is under voluntary and involuntary control?
- internal uretheral sphincters = involuntary
- external uretheral sphincters = voluntary

In females, the urethra is located where?
- between clitoris and vagina

In females, the urethra is located where between the clitoris and the vagina. It is much shorter than the urethra in males, making females more susceptibel to what?
- UTIs

In females, the urethra is located between the clitoris and the vagina. It is much shorter than the urethra in males, making females more susceptibel to UTIs. In addition the external sphincter is not as well developed in females. What can this cause following pregnancy or trauma?
- incontinence (loss of bladder control)
In males the urethra has to pass through what gland and another site?
- passes through the prostate
- then passes through the uro-genital diaphragm and into the penis

























