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The rectum (Structure (Features (Flextures
1. Sacral: anteroposterior,…
The rectum
Structure
Features
Flextures
1. Sacral: anteroposterior, anterior concave
(follows sacrum/coccyx)
2. Anorectal: anteroposteror, anteror convex
(tone of puborectalis, contributes to continence)
3. Lateral x3: superior, intermediate, inferior
Ampulla
Final segment, relaxes to accomodate faeces
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Peritoneal coverings
Superior 1/3: anterior and lateral sides covered
Middle 1/3: anterior covering
Lowe 1/3: no covering
Rectovesical pouch: reflection rectum to posterior bladder (men)
Rectouterine pouch (of Douglas): reflection rectum to posterior vagina/cervix (women)
Location
Contination of sigmoid, starts L3
Terminates at anal canal
Macroscopic appearance
No taenia coli, haustra or omentum
compared with colon
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Anatomical
relations
Anterior
Both: sigmoid, ileum
Men: rectovesical pouch, bladder, prostate, seminal vesicles
Women: rectouterine pouch, vagina, cervix
Posterior
Bones: sacrum + coccyx
Muscles: piriformis, coccygeus, levator ani
Nerves: sacral plexus
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Definition
Distal region of large intestine,
temporary storage of faeces