rectum anal canal

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enjy

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By: rohancool123 (44 month(s) ago)

can u please email bariya.rohan@gmail.com. please..... nice ppt

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ANATOMY RECTUM &ANAL CANAL : 

ANATOMY RECTUM &ANAL CANAL Length-12 cm

ANATOMY/CURVATURES : 

ANATOMY/CURVATURES Lateral curvatures-3 A P curves-2

INTERIOR OF RECTUM : 

INTERIOR OF RECTUM HOUSTON VALVES 1ST-S3vertebra,lt / rt 2nd-(lt) 3rd-most imp & constant (rt)…S5 vertebra 4th-(lt) Functions Support wt of faeces

RELATIONS OF RECTUM : 

RELATIONS OF RECTUM Peritoneal Ant/post/lat

Post relations : 

Post relations

Artery supply : 

Artery supply SRA-rt-ant & post lt MRA- IRA- OTHERS-

VENOUS DRAINAGE : 

VENOUS DRAINAGE importance

Lymphatic drainage : 

Lymphatic drainage

NERVE SUPPLY : 

NERVE SUPPLY SYMP-sup hypogastric plexus(L1,L2) Parasymp-pelvic splanchnic n.

Anal canal anatomy : 

Anal canal anatomy Anatomical- dentate line-anal verge Surgical- anorectal jn-anal verge

Slide 17: 

Anorectal ring -puborectalis -deep ext sphincter -conj long muscle -int sphincter Helps for continence Anorectal angle (80-90 degrees) between rectum and anal canal (maintained by continuous tonic activity of the puborectalis muscle)

muscles : 

muscles PUBORECTALIS -continence -supplied by somatic nerves -funct ii ext anal shincters Ext anal sphincters-vol muscle -supplied by pudendal n. -deep,sup,subcut Int anal sphincters-invol muscle -supplied by autonomic n Long muscle-

Int structure : 

Int structure Dentate line White line of hiltons Column of morgagni Anal valve Anal sinus

Importance of dentate line : 

Importance of dentate line Development-upper>endodermal cloaca -lower>ecto proctodeum Artery-upper>sup rectal art -lower>inf rectal art Venous-upper>sup rectal vein -lower>inf rectal vein Lymph-upper>int iliac lower>sup inguinal nodes Nerve-upper>autonomic -lower>somatic

HILTON’S LINE : 

HILTON’S LINE Represented by anal intersphincteric groove At the lower end of int sphincter m. Bluish pink area above &black skin below

Physiology of continence : 

Physiology of continence Resting Tone → depends on INTERNALSPHINCTER → High pressure zone prevents stool leakage (like LES for reflux) Squeeze pressure (when stool presents distally) – contraction of EXTERNAL SPHINCTER + PUBORECTALIS – prevents stool from leaking out of vault once in the proximal anal canal