Download Anatomy and Physiology of the colon, rectum and anus

Survey
yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Document related concepts

Rectal prolapse wikipedia, lookup

Colonoscopy wikipedia, lookup

Flatulence wikipedia, lookup

Fecal incontinence wikipedia, lookup

Surgical management of fecal incontinence wikipedia, lookup

Transcript
Anatomy and Physiology of the
main organs of the gastrointestinal tract
stomach
Functions of the Stomach





Storing food
Break down of food by releasing
enzymes
Physical breakdown by muscle
contraction
Secretes intrinsic factor – for Vit
B12 absorption in small intestine
Releases food into small intestine
Small intestine
Functions of Small intestine

Major function is – mechanical
digestion and absorption
What is absorbed?
 Bile Salts
 Electrolytes and Vitamins
 Fats
Large Intestine
Large Intestine






Larger diameter than small intestine
Diameter between 2.5 and 7.5 cm
150 cms long
Absorbs among other things - water
and electrolytes
Produces stool fermenting enzymes,
vit B + K
Converts food waste products into
stool
Large Intestine


1000-1500mls fluid enters the colon
in 24 hours – reduced to 100150mls by absorption
Normal transit time from mouth to
anus is 32-41 hours ( sweetcorn
test)
Rectum
Rectum
Follows curvature of the spine, supported
by the pelvic floor muscle.
It is able to distend to store faeces
The sigmo-rectal junction controls passage
of faeces form the sigmoid to rectum
Anal sphincter
Anal sphincter



Held closed by the internal
sphincter under involuntary control
External sphincter is under
voluntary control
The is the only part of the bowel we
have conscious control over
Normal Defaecation
When stool is large enough peristalsis moves it
into rectum
We feel the desire to go – perception of rectal
distension
Rectum stretches, IAS relaxes, EAS contracts to
allow sampling Flatus/stool
We adopt sitting position
Normal Defaecation
Start to push which increases abdominal pressure
EAS, IAS and pelvic floor muscle relax to form a
funnel
Repeated peristalsis moves stool down and out
Once finished IAS contracts and the pelvic floor
muscle returns to supporting role