GIT_2 Flashcards
(77 cards)
From which spinal segments does the nerve supply to the abdominal muscle arise from?
T13 + L1-3
what is the difference between a ganglia and a plexus?
ganglia = PNS synpases (symp NS)
plexus = PNS nerve network associated with ganglia (parasymp NS usually)
Where do the maj and min splanchnic nerves (Symp NS) synpase and what do they supply??
caeliaco-mesenteric ganglia
travel along arteries to abdo organs
Where does the lumbar splanchnic nerves synpase?
CD mesenteric ganglion
travel in hypogastric nerve –> pelvic organs
Where does the vagus lose its effect on the GIT?
transverse colon
after that = pelvic nerve from S1-3
passes through pelvic plexus then follows arteries to desc colon etc
describe the route of the vagus from the brainstem
vago-symp trunk down the neck
L & R vagus in thorax
join D & V as passes through the oesophageal foramen
D –> visc surface of stomach etc; V –> parietal surface of stomach etc
–> caeliac branch –> caeliacomesenteric plexus then to rest of abdo organs
Name the 4 arteries which supply the abdominal wall
- Cr abdominal
- Deep external iliac
- Cr epigastric (+cr superficial)
- Cd epigastric (+Cd superficial)
Major branches off the aorta supply the abdominal organs. Name the main 3
- Caeliac
- Cr mesenteric
- Cd mesenteric
The caeliac gives rise the arteries which supply the liver, stomach, cranial duodenum and what else?
spleen & oesphagus!
describe the branches of the caeliac
- hepatic a
- cyctic a
- R gastric a
- gastro-duodenal a
- L gastric a
- oesophageal a
- Splenic a
- short gastric aa
- pancreatic aa
- L gastro-epiploic a
describe the arterial supply to the stomach (5a)
R gastric –> R lesser curv
L gastric –> L lesser curv
R gastro-epiploic –> R greater curv
gastric aa –> greater curv
L gastro-epiploic –> L greater curv
Describe the arterial supplies to the R lobe of the pancreas
caeliac = Cr pancreatico-duodenal (cr lobe)
cr mesenteric = Cd pancreatico-duodenal
what are the major branches of the cr mesenteric a?
ileo-colic a
cd pancreatico-duodenal
jejunal aa
the ileo-colic a has 5 main branches, name them
- mid colic a
- r colic a
- colic branch
- caecal branch
- mesenteric ileal
which branch of the ileo-colic supplies the a) asc colon and b) desc colon?
a) mid colic
b) colic branch
what does the cd mesenteric supply and with what branches
L colic a –> L colic flex and desc colon
cranial rectal a –> rectum (cranial)
The kidneys, ovaries and testicles recieve arterial supply directly from the aorta via different branches. Name them
L&R renal aa
L&R ovarian aa
L&R testicular aa
most of the blood supply to the GI organs will anastomose. why does this happen?
to prevent ischemia in the event of an arterial blockage eg thrombus or embolism
Do all the abdominal organs drain via the hepatic portal system ?
NO. only the GI ones.
(Unless you are a reptile/bird/fish with a renal portal system as well)
fat (chylomicrons) do not drain via this either
what organs drain directly into the Cd VC?
- Liver (ha ha…..)
- kidneys
- ovaries
- testicles
- NOT L test vein as it drains into the renal v..
Mostly there are corresponding veins to arteries. Name the exceptiions
No celiac vein (not needed as hepatic v is there already!)
L gastric drains into the splenic v NOT hepatic portal (long winded route..)
L testicular v drains into the L renal v NOT Cd VC?! werid..
In the simple stomach the greater and lesser curv of stomach are supplied by L&Rgastro-epipl and L&R gastric. In the ruminant stomach what is the equivalent
ruminoreticulum & g curv of abom = L&R gastro-epip
omasum & l curv of abom = L&R gastric
The caecal supply in the ruminant is the same as the dog (caecal br of ileo-colic and anti-mesenteric ileal). What is it in the horse and pig?
medial caecal
lateral caecal
NO antimesenteric!
what is the PX asc colon referred to in the horse, cow and pig? What supplies it (arterially)
horse = ventral colon
pig/cow = centripetal coils
arterial supply = colic branch of ileo-colic
