Anatomy Colon Flashcards
At what point does the sigmoid colon terminate
S3 where it is continuous with the rectum
Where does the ascending colon terminate?
At the right colic flexure (hepatic flexure)
What is the attachment of the transverse colon to the posterior abdominal wall
Transverse mesocolon
What is the attachment between the attachment between the transverse colon and the greater curvature of the stomach
Gastrocolic ligament
Where does the transverse mesocolon terminate and become the descending colon?
The left colic flexure or the splenic flexure
What is the peritoneal attachment of the sigmoid colon?
The sigmoid mesocolon
What sort of peritoneal covering does the rectum have?
None
Trick question lol
Where does the rectum lie
Anterior to half of the sacrum and the coccyx
Posterior to the bladder, prostate and in women the uterus
What sort of muscle lines the outside of the rectum?
Longitudinal muscle cells called Taenia coli muscle
What is the name of the lower part of the rectum?
The ampulla of the rectum
What lies medially to the rectum?
Fatty connective tissue lie on either side of then rectum
What forms the pelvic diaphragm
Lavator ani anterior
Coccygeus muscle posterior
What part of the elevator ani sits in front of the rectum?
The puborectais part
What is the angle formed between the rectum and anal canal
The perineal flexure
What maintains the perineal flexure between the rectum and the anal canal?
The pbuorectalis part of the levator ani
What maintaines the closure of the anal canal
Involuntary internal anal sphincter muscles
Voluntary external anal sphincter muscles
What is the internal anal sphincter muscles a continuation of?
The circular smooth muscle of the intestine
What are the ligament attachments of the external involuntary anal sphincter muscles?
Anococcygeal ligament (posteriorly)
Central perineal tendon anteriorly
What portion of the internal sphincter muscles of the anal canal does it cover?
Proximal 2/3 of the anal canal
Artery of the midgut and what it supplies
Superior mesenteric
Distal duodenum
Jejunoileum
Ascending colon
First part of the transverse colon
At what level does the superior mesenteric originate
L1
Branches of the superior mesenteric
Pancreaticoduodenal artery
Right colic artery
Ileocolic artery
Ileal artery
Mid colic artery
Jejunal artery
Pancreaticoduodenal artery supplies blood to…
Inferior head of pancreas
Distal portion of the duodenum
Jejunal artery supplies….
The jejunum
