Anatomy of bladder Flashcards

1
Q

Which body region is the bladder located in?

A

Pelvis

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2
Q

Where in the pelvis is the bladder located?

A

Posteriorly to pubic bones

In males, antero-superiorly to prostate gland
In females, anteriorly to vagina

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3
Q

How does the bladder relate to the peritoneum?

A

Inferiorly to the peritoneum

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4
Q

What is the bladder wall made up of?

A

Smooth muscle fibres oriented in different directions

called bladder detrusor muscle

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5
Q

What are the parts of the bladder?

A

Apex

Body

Fundus

Neck

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6
Q

What is the apex of the bladder?

A

Superior part of bladder that points to the pubic symphysis

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7
Q

What is the body of the bladder?

A

Middle part of bladder

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8
Q

What is the fundus of the bladder?

A

Posterior part of bladder

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9
Q

What is the neck of the bladder?

A

Inferior part of bladder

where fundus and inferolateral surfaces of bladder converge

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10
Q

What shape is the bladder when it’s empty?

A

Tetrahedral

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11
Q

What are the surfaces of the bladder when it’s empty?

A

Superior

Posterior

Inferolateral x2

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12
Q

What is the function of the bladder?

A

Temporary storage of urine

Assist with expulsion of urine

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13
Q

How is the bladder adapted to storing urine?

A

It is hollow

Its walls are distensible

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14
Q

How is the bladder adapted to expulsing urine?

A

The musculature of the bladder contracts

The sphincters relax

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15
Q

How does urine enter the bladder?

A

Via the ureters

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16
Q

Where does urine leave the bladder?

A

Internal urethral orifice

17
Q

What part of the bladder contains the openings for the ureters and the internal urethral orifice?

A

Fundus of bladder

18
Q

What is the trigone of the bladder?

A

Triangle formed by the openings for the ureters superiorly, and the internal urethral orifice inferiorly, in the fundus of the bladder

19
Q

How does the surface of the trigone compare to the rest of the bladder?

A

Surface of trigone is smooth

rest of surface of bladder is folded

20
Q

What structures control the release of urine from the bladder?

A

Internal urethral sphincter

External urethral sphincter

21
Q

Where is the internal urethral sphincter located?

A

At the neck of the bladder

proximal part of urethra

22
Q

What is the internal urethral sphincter made up of?

A

In males, circular smooth muscle fibres

In females, smooth muscle of bladder neck and proximal urethra themselves

23
Q

Where is the external urethral sphincter located?

A

In males, inferiorly to the prostate gland around the membranous urethra

24
Q

What is the external urethral sphincter made up of?

A

Skeletal muscle

25
What happens to the shape of the bladder as it fills with urine?
Becomes more spherical
26
What happens to the position of the bladder as it fills with urine?
It superior surface ascends