Urinary Tract Part Deux

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Urinary Tract Part Deux

• Boggusrl_at_email.uc.edu

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URETER

• 3 layers
• Mucosa epithelium (TRANSITIONAL) plus some
  underlying CT, that you all know is called the
  LAMINA PROPRIA
• Muscularis has. muscle! Imagine that.
• 2-3 bundles of smooth muscle to be exact
  depending where you are in the journey of the
  ureter
• Adventitia just like every other adventitia you
  have enjoyed this year, its just some CT, can
  have blood vessels and whatnot in it

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Ureter, in all its glory
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This look familiar?
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It should!

• Its the transitional epithelium of the mucosa in
  the ureter
• A nice memory of the fun we all had in block one

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Ureter contd

• How do you tell it apart from the urethra?

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Ureter vs. urethra

• Because the urethra is shaped like a half
  moon/crescent and this isnt
• Because the epithelium of the ureter is
  transitional epithelium and the urethra can be
  pseudostratified columnar or stratified squamous
  or transitional
• Because you often get a nice glimpse of vagina
  when they show you urethra on the glass slide

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Half moon.. kinda. Whatever.
Not half moon Im thinking more STAR shaped
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ureter

• Lets talk about the muscularis
• Tell me about how the layers are oriented

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Muscle of the ureter, everyones favorite
dinnertime subject

• Well rachel, at the top of the ureter there are
  only two inner longitudinal and outer circular
• And at the lower 1/3 part of the ureter there can
  be THREE WHOLE LAYERS, with the additional layer
  being outer longitudinal so inner longitudinal,
  middle circular, outer longitudinal

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Inner longitudinal
Outer circular
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Bladder

• Same layout as ureter mucosa, muscularis,
  adventitia
• Nice example of transitional epithelium hello
  block one!
• Is mucosa thicker in bladder or ureter?

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bladder

• In the bladder!
• This is sensible because the bladder has to hold
  more pee than the ureter, thus needs stronger
  walls

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Where are we?
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• Well, it is transitional epithelium, yes? So you
  know it could be from the bladder OR the ureter
  OR the urethra. All three can have transitional.
  However, because I took this directly from your
  online lab manual I know it is bladder.

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bladder

• How many layers of smooth muscle are there in the
  muscularis of the bladder?

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• THREE layers of bundled smooth muscle

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THREE
ONE
TWO
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Serosa vs. adventitia

• Whats this serosa everyone is talking about?
• Well, in the BLADDER ONLY, if there is a layer of
  mesothelium OUTSIDE THE ADVENTITIA, then its a
  serosa
• What a nice written question this would make!

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Girl power

• Urethra is cooler than the ureter because it can
  have THREE different kinds of epithelium
  transitional, pseudostratified columnar and
  stratified squamous.
• Why dont you tell me where each of these are
  found in the path of the urethra

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Uretha epithelium another good dinnertime topic

• Well at the top you have transitional, then in
  the middle you have pseudostratified columnar,
  and at the bottom you have stratified squamous
  just like in the VAGINA!!

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Pseudostratified epithelium of urethra
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• I personally think the urethra looks nothing like
  a half moon or crescent. I always thought it
  looked more like a gecko. You be the judge

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My theory
Gecko tail
Gecko mouth
Gecko legs
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Or half moon?

I think not
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urethra

• What does the uretha have in the epithelium that
  ureter does not?

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urethra

• Glands, beotch

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urethra

• What else does the lamina propria (remember, with
  the epithelium makes up the mucosa) have?

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• 1. Venous plexus
• 2. Mucus glands (of Littre as if you care)
• So in the urethra there are intraepithelial mucus
  glands and also more mucus glands in the lamina
  propria

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More urethra fun!

• So you have a muscularis here as well. Speak to
  me about the layers and their orientation.

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• Well, like the urethra, inner longitudinal and
  outer circular, but if you are down far enough
  (you would see what epithelium here??? Simple
  squamous or pseudo) there can be a outer circular
  sphincter of skeletal muscle (vs. smooth muscle
  that you see everywhere else)

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Venous plexus in lamina propria
Inner long. muscle
Outer circular muscle
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adventitia

• Continuous with vagina, which you often see RIGHT
  NEXT TO IT this is KEY if you get a glass
  slide. You see vag, its gotta be urethra.

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gecko
Shared adventitia
vag
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QUIZ TIME
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(No Transcript)
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• Well its the urethra because it looks like a
  gecko
• Its in the lamina propria
• MUCUS GLAND OF LITTRE

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• Inner longitudinal smooth muscle bundle in the
  ureter

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Red area is???
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• Lamina propria!
• Remember lamina propria epithelium mucosa
• So if they circle both you say MUCOSA!

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What is this? How do you know?
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• URETER
• Star-shaped
• Transitional epithelium

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What is this?
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Urethra!

• Crescent/gecko/half moon shape

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What kind of epithelium
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• Well you know its the ureter because its star
  shaped
• So it has to be transitional

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hmmmmm

• Well it looks like fat, right?
• Is fat in the mucosa?
• no
• Is fat in the muscularis?
• no
• Is fat in the adventitia?
• YES! Adventitia is just a bunch of loosish CT and
  can have vessels and fat in it!
• So I would say adipose tissue in the ureter
  adventitia