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Download MBBS Urinary Bladder Lecture PPT

Download MBBS (Bachelor of Medicine and Bachelor of Surgery) Latest Urinary Bladder Lecture PPT

This post was last modified on 30 November 2021


INTRODUCTION

?IT IS A HOLLOW MUSCULO-

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MEMBRANOUS SAC WHICH ACTS

AS A RESORVOIR FOR THE URINE.

? IT IS THE MOST ANTERIOR

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ELEMENT OF THE PELVIC VISCERA.

?IT IS A SUBPERITONEAL ORGAN

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AND HAS PARIETAL PERITONEUM

ONLY ON ITS SUPERIOR SURFACE.

?URINE ENTERS THE BLADDER VIA

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URETERS AND EXITS VIA THE

URETHRA.
ANATOMICAL LOCATION

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When "Empty" , the adult urinary bladder is located in the "Lesser

pelvis" lying partially superior to and partially postetior to the pubic

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Bones.
As the bladder fills it enters the "Greater Pelvis".
In some individuals, a full bladder may ascend to the level of the

"Umbilicus".

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In infants and young children,the urinary bladder is in the abdomen

even when empty.

?An empty bladder is somewhat tetrahedral and oval when full.

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?Has a base (fundus), neck, apex, a superior and two inferolateral

surfaces.

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?Mean capacity is 220 ml.

?150-250 ml collection lead to desire to micturition.

?Volume >500 ml caused pain due to its distension.

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Superior surface-peritoneal

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Base: upper part peritoneal

Other : non peritoneal

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Surfaces:

?Superior surface

?Posterior surface (Base)

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?Inferolateralsurfaces

Apex-directed anteriorly

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Neck-directed inferiorly


Neck is encircled by

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prostate in MALES




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BASE OF BLADDER(Male)


Base of urinary bladder of

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male

? Rectovesicle pouch

? Seminal vesicle

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? Ampulla of vas deference

? Rectovesicle fascia

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(Denonvillier's fascia)



NECK OF BLADDER

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?The neck of the bladder surrounds the origin of the urethra.

?The neck is the most inferior and also the most 'fixed' part of the bladder. In male it is

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surrounded by prostate gland.

?It is anchored into position by a pair of tough fibromuscular bands

?pubovesical ligaments in female

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?puboprostatic ligaments in male.


SUPERIOR SURFACE OF BLADDER

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Is triangular in shape,bounded on

each side by the lateral borders

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extending from ureteric orifices

posterolaterally to the apex

anteriorly &posteriorly by the

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posterior border which joins the

ureteric orifices.

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In the male, it is completely covered

by the peritoneum which separates

it from: coils of the ileum, and/or

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sigmoid colon.Along its lateral

borders, the peritoneum is reflected

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on to the pelvic walls.



In the female, it is

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covered by the

peritoneum except

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for a small area

near the posterior

border, which is

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related to the

supravaginal part

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of the uterine

cervix. Here the

peritoneum

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is reflected on to

the uterine

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isthmus forming

vesicouterine

pouch.

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INFEROLATERAL SURFACE OF BLADDER

These surfaces are separated from each other,

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anteriorly

by the anterior border, and from the superior surface by

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the lateral borders.

The inferolateral surfaces are devoid of peritoneum


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INFEROLATERAL SURFACE OF BLADDER

Medial view of lower part of

lateral pelvic wall

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RETROPUBIC SPACE(of RETZIUS)


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RELATIONS OF THE BLADDER


SUPPORTS OF THE BLADDER

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False ligaments

1. Median

umbilical fold

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2. Medial

umbilical fold

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3. Lateral false

ligaments

4. Posterior

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false

ligaments
SUPPORTS(contd..)

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True Ligaments

?Puboprastatic or

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Pubovesicle ligament

?Lateral ligament

?Posterior ligament

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?Median umbilical

ligament

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INTERIOR OF BLADDER

coronal section.

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TRIGONE OF URINARY BLADDER

It is smooth triangular part of

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urinary bladder.

Mucosal lining of trigone is

smooth and firmly attached to the

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underlying wall of the bladder.

Formed by Right and left

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ureteral orifices.

Once the trigone of urinary

bladder is stretched to a certain

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degree, siganl is sent to the brain

that bladder needs to be

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emptied.



URETERAL ORIFICES

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These are Slit like openings through which ureters enter the bladder

on the posterolateral angles of the trigone of urinary bladder.

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MERCIER'S BAR

It is a mucous membane present between the two ureteral

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orifices.

It is also called "InterUreteral Fold"


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NECK OF URINARY BLADDER

It is the lowest portion of the bladder through which the "Urethra"

arises.

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INTERNAL URETHRAL SPHINCTER


INTERNAL URETHRAL SPHINCTER

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It is comprised of smooth muscle that is located at the junction of

urethra and the urinary bladder.
It is innervated by S2-S4 nerves of the pelvic plexus.

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It's function is to constrict the internal urethra ,preventing the urine

leakage and also prevents the Retrograde ejaculation (Ejaculatory Reflex

) of semen into the bladder.

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DETRUSOR MUSCLE

It is also referred as " Muscularis Propria".

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It is smooth muscle , found around the wall of bladder ,comprised of

inner and outer longitudinal, and middle circular layer.

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This muscle is relaxing during accomulation of urine in the bladder,

and contracts only during urination to void and empty the bladder.
ARTERIAL SUPPLY

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Branches of internal iliac arteries.

Superior vesical arteries supply anterosuperior parts of the

bladder.

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In males, inferior vesical arteries supply the fundus and neck

of the bladder.
In females, vaginal arteries replace the inferior vesical

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arteries and small branches to posteroinferior parts of the

bladder.
Obturator and inferior gluteal arteries also supply small

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branches to the bladder.



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VENOUS DRAINAGE

The veins draining from the bladder correspond to the arteries

.

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Veins from the Vesical venous plexus drain into the internal iliac

veins.
INNERVATION OF URINARY BLADDER

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Pelvic Nerve (Parasympathetic nerve) comes from the

sacral region of spinal cord. It is not under our control. It

causes contraction of the Detrusor muscle.

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Pudendal nerve (Somatic nerve) causes contraction of

External Sphincter. We are firing pudendal nerve when we

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are trying to hold our urine.

Hypogastric nerve (Sympathetic nerve) causes relaxation of

Detrusor muscle and contraction of Internal sphincter.

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Afferent Pelvic nerve that is sensory and comes from the

detrusor muscle. It is stimulated when the bladder is

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stretched.

LYMPHATIC DRAINAGE OF BLADDER

In both sexes, lymphatic vessels leave the superior

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surface of the bladder and pass to the "External iliac

lymph nodes".

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Those from fundus pass to the "Internal iliac lymph

nodes".

Some vessels from the neck of bladder drain into the

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"Sacral" to "Common iliac lymph nodes".


APPLIED ANATOMY

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1. Trabeculated bladder- due to chronic

obstruction to the outflow of the urine by

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enlarged prostate or stricture of the urethra.

2. Suprapubic cystostomy-An extraperitoneal

approach of opening the cavity of the urinary

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bladder.
APPLIED ANATOMY

3. Neurogenic bladder

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a. Automatic reflex bladder.
b. Autonomous bladder
Coverings of Kidney


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?Fibrous capsule (true capsule)

?Perinephric fat

?Renal fascia( fascia of Gerota)

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?Paranephric fat
Renal Fascia or fascia of Gerota

?Consists of two layers

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1.Anterior layer or fascia of Toldt

2.Posterior layer of Fascia of Zuckerkandl

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?Laterally: Both layer fused and continued with the

fascia transversalis

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?Medially: Layers do not fuse.