The document describes the anatomy and histology of the ureter, urinary bladder, and urethra. The ureter has three layers - mucosa, muscle layer, and adventitia. The urinary bladder also has these three layers with transitional epithelium lining the mucosa. The urethra acts as the passage for urine from the bladder to outside. It has mucosa, submucosa, and muscular layers. The male urethra is longer than the female urethra and has prostatic, membranous, and spongy regions.
2. Sensitivity: Internal
Ureter:
The wall of ureter has 3 layer
from inner to outer: Mucosa
Muscle layer
Adventitia
A) Mucosa:
- Mucosa consist of lining epithelium and lamina
propria
- Mucous membrane is lined by transitional
epithelium or urothelium
3. Sensitivity: Internal
- In transverse section the lumen has a star shaped
appearance, that is due to longitudinal folds of
the mucosa. This fold disappear when the ureter
is distended.
- The urothelium composed of following three
layer:
1) A single layer of small basal cell resting on a
very thin basement membrane. These cells are
cuboidal or columner
4. Sensitivity: Internal
2) Intermediate cell layer
-contain one to several layer of polyhedral cells
-the thickness of these layer varies with the
state of urinary tract expansion, which in human may
reach up to five layer thick
3) Superficial layer
- The layer contain large, polyhedral or bulbous
cell called umbrella cells which are occassionally bi or
multinucleated and are highly differentiated to
protect underlying cell against the cytotoxic effect of
hypertonic urine
5. Sensitivity: Internal
- The shape of these epithelial cells depends on the
filling state of the excretory passage
- In empty urinary bladder, dome shaped cells
are roughly cuboidal, when bladder is filled, they are
stretched and appear as flat or squamous
14. Sensitivity: Internal
Urinary bladder
Inner to outer
1) Mucosa
consist of lining epithelium and lamina propria
It is lined by transitional epithelium
The epithelium of undistended bladder is 5-6 cell layer
thick and distended bladder is 3-4 cell layer thick
The mucosa is thrown in to fold or rugae when the
bladder is empty
15. Sensitivity: Internal
Lamina propria
connective tissue fiber, Rich in blood vessels
2) Muscular layer
The muscularis consist of three poorly delinated
layer collectively called the detrusor muscle, which
contract to empty the bladder. These are inner and
outer longitudinal and middle circular. Smooth
muscle bundle of the detrusor muscle are irregularly
arrange.
16. Sensitivity: Internal
smooth muscle of urinary passage is mixed with connective tissue (
collagen fiber) , so that it form parallel bundle rather than pure
muscular sheet.
17. Sensitivity: Internal
3) Serosa/ adventitia
Most of the bladder surface is lined by adventitia,
made of fibroelastic connective tissue carrying blood
vessels, nerve, lymphatics.
The superior surface is covered by peritoneum
19. Sensitivity: Internal
Urethra
-Urethra is a tube that carries the urine from
bladder to the exterior
-The urethral mucosa has large longitudinal folds,
giving it a distinctive appearance in cross section
20. Sensitivity: Internal
-Male urethra is much longer 20 cm than female 4-
5 cm
-The basic structure of the two is same
-The wall has three layered-
Mucosa
Submucosa
Muscular
21. Sensitivity: Internal
1) Mucosa
-consist of lining epithelium and lamina propria
-Both male and female the greater part of urethra
is lined by pseudostratified columner epithelium. A
short part adjoining the urinary bladder is lined by
transitional epithelium, while the part near the
external orifice is lined by stratified epithelium.
Lamina propria
Here mucous secreting tubular gland present
22. Sensitivity: Internal
2) Submucosa
3) Muscular
inner longitudinal
outer circular
This arrangement is better in female urethra
In male urethra it is well defined only in
membranous and prostatic part
23. Sensitivity: Internal
Male urethra
- Male urethra is a common tubular passage for the
elimination of urine and semen
- It extends from the internal urethral orifice at the
apex of trigone of urinary bladder to the external
urethral orifice close to the tip of glans penis
- 3 parts: prostatic
membranous
spongy
24. Sensitivity: Internal
Prostatic part:
- Lined by transitional epithelium
- 3-4 cm in length
- It is the widest and most dilatable part of male
urethra
- On cross section it present crescentic lumen
- It runs almost vertically downwards through the
prostate from the base to slightly in front of the
apex, at the junction of anterior one third and
posterior two third of the gland
25. Sensitivity: Internal
Membranous urethra
- Lined by stratified or pseudostratified columner
epithelium
- Its anterior wall 2 cm and posterior wall 1.25 cm
- On cross section it is stellate in appearance
- It extend from the prostate to the upper surface of
bulb of penis
- It is surrounded by sphincter urethrae muscle (
striated muscle) to form external sphincter
- Pierce the deep perineal pouch
26. Sensitivity: Internal
Spongy urethra
- Lined by pseudostratified columner epithelium
except at its distal ends where it is lined with
stratified squamous epithelium
- 15 cm long
- It passes through the bulb, body and glans penis
and terminate at the external urethral orifice close
to the tip of glans
- In its course it present two dilatation- intrabulbar
fossa within bulb of penis and navicular fossa in the
glans penis
27. Sensitivity: Internal
Female urethra
- 4-5 cm long
- It begins from the internal urethral orifice of the
bladder and passes downwards and forwards
embedded in the anterior wall of vagina
-lined initially nearer to internal urethral orifice is
transitional epithelium then by stratified squamous
epithelium and some areas of pseudostratified
columner epithelium
