Flashcards in abdominal wall and intestines Deck (35):
what is the function of the external oblique muscle?
contralateral rotation of the torso
what is the origin and insertion of the external oblique muscle?
o - ribs 5-12
i - iliac crest, pubis tubercle, linea alba
what is the external oblique aponeurosis?
a thin but strong membranous structure, it's fibres are directed downwards and medially.
above it is covered by and gives the origin to the pectoralis major.
below it's fibres are closely aggregated together and extend obliquely across from the anterior superior iliac spine to the pubic tubercle and pectineal line.
what is the function of the internal oblique muscle?
compresses the abdomen; unilateral contraction rotates verterbral column to same side.
what is the origin and insertion of the internal oblique muscle?
o - ingual ligaments, iliac crest and lumbodoral fascia.
i - linea alba, pectin pubis and ribs 10-12
which artery supplies the internal oblique muscle?
the subcostal arteries.
what is the function of the transverse abdominis muscle?
compresses abdominal contents
what is the origin and insertion of the transverse abdominis muscle?
o - iliac crest, ingual ligament, thoracolumber fascia and costal cartilages.
what artery supplies the transverse abdominis muscle?
the subcostal arteries
what is the function of the rectus abdominis muscle?
flexion of the lumbar spine
what is the origin and insertion of the rectus abdominis?
o - crest of the pubis
i - costal cartilage of ribs 5-7, xiphoid process
what is the arterial supply to the rectus abdominus?
the inferior epigastric artery
where does the superior epigastric artery arise from? where does it anastomose and what with?
arises from internal thoracic artery.
anastamoses with the inferior epigastric artery at the umbullicus
where does the inferior epigastric artery arise from? where does it anastamos and what with?
arises from the external iliac artery and anastomoses with the superior epigastric artery at the umbullicus.
what is the greater omentum?
it is a large apron like fold of visceral peritoneum that hangs down from the stomach.
what is the jejunum?
part of the small intestine between the duodenum and ileum
what is the ileum?
part of the small intestine following the jejunum
what seperates the ileum and caecum?
the ileocecal valve
what is the caecum?
it is an intraperitoneal pouch between the small and large intestine. it's considered the beginning of the colon, it connects the ileum to the ascending colon.
what is the appendix?
a blind ended tube connect to the caecum
what are the plicae circularis?
the numerous crescentic folds of mucous membrane found in the small intestine, especially in the lower part of the duodenum and jejunum.
what is meckel's diverticulum?
it's a true congenital diverticulum, a slight bulge in the small intestine prescent at birth and a vestigial remnant of the omphalomesentric duct (joins yolk to part of developing lumen) present in 2% pop, males experience more symptoms.
what is the ascending colon?
the first main part of the colon, passes upwards from caecum on the right hand side of the abdomen.
what is the hepatic flexure?
it is the flexure between the ascending and transverse colon
what is the transverse colon?
the middle part of the colon, passing from right to left across the abdomen below the stomach.
what is the splenic flexure?
the flexure between the transverse and descending colon
what is the descending colon?
part of the colon on the left hand side of the abdomen, passes downwards towards the rectum.
what is the sigmoid colon?
the S shaped part of the colon that leads to the rectum from the descending colon
what is the taenia coli?
they are 3 ribbons of longitudinal muscle on the outside of the colon.
what are haustrations?
they are small pouches caused by sacculation, this give the colon it's segmented appearance.
what is the epiploic appendix?
small pouches of peritoneum filled with fat and situated along the legnth of the colon. (cheifly in transverse and sigmoidal parts)
what is the mesentery of the small intestine?
it's folds of membranous tissue that within it are the arteries and nerves that supply the intestine.
where does the superior mesenteric artery arise from? what does is supply?
arises from abdominal aorta
supplies the second part of the duodenum, jejunum, ileum, caecum, ascending colon and transverse colon
what are the jejunal and ileum arcades?
loops of arteries around the jejunum and ileum