Abdomen Flashcards
3 muscles of abdominal wall
external oblique, internal oblique, transverse abdominus, rectus abdominus
innervation of abdominal wall
ventral rami of T7-L1
blood supply of abdominal wall
intercostal, musculophrenic, and superior/inferior epigastric vessels
aponeuroses
flat tendons
which muscles of the abdominal wall have aponeuroses
external/internal obliques and transverse abdominus
linea alba
central tendinous line where the aponeuroses interdigitate
what muscles of abdominal wall have linea alba
rectus abdominus - breaks up the muscle bellies
aponeuroses relationship to rectus abdominus muscle
wrap around it to form the anterior and posterior rectus sheaths (below umbilicus is anterior sheath only)
transversalis fascia
deep fascia of abdomen that sits posterior to rectus abominus muscle below umbilicus
3 flat muscles of abdominal wall and what are they a continuation of
internal/external obliques and transverse abdominus, continuation of the 3 intercostal muscle layers
tendinous intersections
transverse fibrous bands where rectus sheath attaches to rectus abdominus muscle
anterior rectus sheath
aponeurosis of external oblique and part of aponeurosis of internal oblique
posterior rectus sheath
aponeurosis of internal oblique and aponeurosis of transverse abdominus
arcuate line
where posterior rectus sheath ends
layers of abdominal wall (superficial to deep)
skin, superficial fascia (Camper’s fascia and Scarpa’s fascia), external oblique, internal oblique, transverse abominus, transversalis fascia, parietal peritoneum
direct inguinal hernia
protrudes through Hesselbach’s triangle
inguinal canal
oblique passageway through which the spermatic cord or round uterine ligament passes
indirect inguinal hernia
due to congenital defect in inguinal canal
direct inguinal hernias occur ____ to inferior epigastric arteries
medial
indirect inguinal hernias occur ________ to inferior epigastric arteries
lateral
which type of hernia occurs more often in women
femoral
location of femoral hernias
in medial-most compartment of femoral triangle, below inguinal ligament
inguinal ligament
free edge of aponeurosis of external oblique muscle
inguinal hernias occur ____ to inguinal ligament
superior
what normally occupies most medial compartment of femoral triangle
lymphatics
umbilicus lies at what vertebral level
T10
pain in epigastric region referred from
foregut
pain in umbilical region referred from
midgut
pain in pubic/hypogastric region referred from
hindgut
NVB of anterolateral abdominal wall travels between which muscles
transverse abdominis (deep), internal oblique (middle)
nerves of anterolateral abdominal wall have what origin
ventral rami of T7-L1
T7-T11 NVB
continuations of intercostal NVB
T12 nerve is called
subcostal nerve
L1 nerve branches are called
iliohypogastric, ilioinguinal
terminal branches of the internal thoracic artery
superior epigastric, musculophrenic arteries
branches of the external iliac artery
inferior epigastric, deep circumflex arteries
superior and inferior epigastric arteries location
run posterior to the rectus abdominis muscle within the posterior rectus sheath
planes of abdominal quadrants
midsaggital, transumbilical (T10)
McBurney’s point location
1/3 between anterior iliac spine and umbilicus
McBurney’s point significance
attachment point between appendix and cecum, pain is indicative of appendicitis
Planes of abdominal regions
midclavicular, subcostal, intertubercular
3 superior regions (R to L)
Right hypochondriac, epigastric, left hypochondriac
3 middle regions (R to L)
Right flank, umbilical, left flank
3 inferior regions (R to L)
R groin/inguinal, pubic/hypogastric, L groin/inguinal
peritoneum is composed of (histology)
simple squamous epithelium
visceral and parietal peritoneum are continuous at the
mesentery
the peritoneum is ____ in men and ____ in women
closed, open
what penetrates the peritoneum in women
the uterine tubes
what does the peritoneal cavity contain
serous peritoneal fluid
any organ that has a mesentery is
intraperitoneal
parietal peritoneum sensory innervation
T7-L1
lesser sac aka
omental bursa
location of lesser sac
posterior to the stomach and inferior to the liver
greater and lesser sac communicate through
epiploic foramen of Winslow
mesentery
double layer of peritoneum reflecting from the abdominal wall to enclose viscera
mesentery of small intestine aka
mesentery proper
mesentery of transverse colon aka
transverse mesocolon
mesentery of sigmoid colon aka
sigmoid mesocolon
omentum
a broad, double layer of peritoneum passing from the stomach to another organ
greater omentum
passes from stomach to transverse colon
lesser omentum
passes from stomach to liver
greater omentum drapes over the
transverse colon
ligaments
parts of mesenteries between organs or between organ and body wall
lesser omentum forms the anterior wall of the
lesser sac
divisions of greater sac and what they are divided by
supracolic and infracolic compartments divided by transverse mesocolon
gutters of the infracolic compartment and their locations
right and left paracolic gutters to the left and right of ascending and descending colon
3 unpaired branches of abdominal aorta
celiac trunk, superior mesenteric artery, inferior mesenteric artery
celiac trunk supplies
foregut
SMA supplies
midgut
IMA supplies
hindgut
components of foregut
esophagus, stomach, first half of duodenum, liver, pancreas, gallbladder, spleen
components of midgut
second half of duodenum, jejunum, ileum, ascending colon, first 2/3 of transverse colon
components of hindgut
last 1/3 of transverse colon, descending colon, sigmoid colon, rectum
anastomosis at foregut-midgut junction
superior pancreaticoduodenal artery (celiac trunk) with inferior pancreaticoduodenal artery (SMA)
anastomosis at midgut-hindgut junction
middle colic artery (SMA) with left colic artery (IMA)
location of anastomosis at foregut-midgut junction
mid-duodenum
location of anastomosis at midgut-hindgut junction
splenic flexure
which anastomosis is most vulnerable to ischemia
midgut-hindgut junction
marginal artery
arterial arch formed by anastomoses of left, middle, and right colic arteries
why are the loops of small intestine vulnerable to ischemia?
intestinal branches of SMA do not anastomose with branches of celiac trunk or IMA
rectal anastomosis
superior rectal artery (IMA) with middle and inferior rectal arteries (internal iliac artery)
pre-aortic lymph nodes
celiac nodes, SMA nodes, IMA nodes
path of lymph from viscera
travel along arterial paths to pre-aortic nodes, then to cisterna chyli to enter venous circulation
cisterna chyli
dilated proximal end of thoracic duct
enteric nervous system
intrinsic network of ganglia with connections to ANS that coordinates peristalsis and secretion
sympathetic innervation to foregut
greater splanchnic nerves to celiac ganglion
sympathetic innervation of midgut
greater and lesser splanchnic nerves to superior mesenteric ganglion
sympathetic innervation of hindgut
lumbar and sacral splanchnic nerves to inferior mesenteric ganglion and hypogastric plexus/pelvic ganglia
greater splanchnic nerves level
T5-T9
lesser splanchnic nerves level
T10-T11
lumbar and sacral splanchnic nerves level
L1-L2
enteric ganglia and nerve plexuses
myenteric plexus and submucosal plexus within layers of intestinal wall
origin of preganglionic sympathetic nerves for foregut
T5-T9
sympathetic action in gut
decreased motility, contraction of sphincters, pathway for afferent fibers for visceral referred pain
preganglionic sympathetic nerve fibers for foregut are the
greater splanchnic nerves
postganglionic sympathetic nerve fibers fibers for foregut
celiac plexus via the celiac ganglia
preganglionic parasympathetic nerve fibers for foregut
vagus
parasympathetic action in gut
increased motility, relaxation of sphincters
preganglionic sympathetic nerve fibers in midgut
greater and lesser splanchnic nerves
postganglionic sympathetic nerve fibers in midgut
superior mesenteric plexus via the superior mesenteric ganglia
preganglionic parasympathetic fibers in midgut
vagus
route of referred pain in foregut
greater splanchnic nerves
route of referred pain in midgut
lesser splanchnic nerves
origion of preganglionic sympathetic neurons in hindgut
L1-L2
preganglionic sympathetic neurons in hindgut
lumbar and sacral splanchnic nerves
postganglionic sympathetic neurons in hindgut
inferior mesenteric plexus via the inferior mesenteric ganglia, hypogastric plexus via the pelvic ganglia
route of referred pain for hindgut
lumbar and sacral splanchnic nerves
preganglionic parasympathetic neurons in hindgut
pelvic splanchnic nerves
origin of preganglionic parasympathetic neurons in hindgut
S2-S4
2 main lobes of liver
right and left
2 smaller lobes that are part of left lobe
caudate and quadrate
portal vein
carries venous drainage from GI tract, accessory organs, and spleen to liver
exocrine secretion of liver
bile
what does the liver store
glycogen, fat, proteins, vitamins, iron
what does the liver produce
fuels and plasma proteins, bile acids
what does the liver metabolize
toxins
what does the liver excrete
bilirubin
blood supply to liver
proper hepatic artery
proper hepatic artery is a branch of
common hepatic artery off the celiac trunk
hepatoduodenal ligament carries
the portal triad
components of portal triad
proper hepatic artery, portal vein, common bile duct
what percentage of blood enters liver from proper hepatic artery
30%
what percentage of blood enters liver from portal vein
70%
path of blood out from liver
hepatic veins to IVC
path of bile out of liver to gallbladder
left and right lobes drain to left and right hepatic ducts which combine to form common hepatic duct, then travels through cystic duct to gallbladder
path of bile from gallbladder
leaves GB to enter cystic duct then goes to common bile duct, then to hepatopancreatic ampulla of Vater, then through major duodenal papilla to enter second part of duodenum
hepatopancreatic ampulla is surround by
sphincter of Oddi
function of gallbladder
stores and concentrates bile
gallstones aka
cholelithiasis
gallstones form from
bile, billirubin, and cholesterol
most common place gallstones lodge
distal end of common bile duct
common places gallstones lodge
hepatic and cystic ducts
biliary colic
intense, spasmodic pain caused by gallstone lodged in cystic duct
cholecystitis
inflammation of gallbladder caused by obstruction of cystic duct and buildup of bile within GB
referred pain from cholecystitis
posterior thoracic wall and right shoulder
pain of cholecystitis course
starts epigastric and becomes right hypochondriac
choledocholithiasis
stones in common bile duct
symptoms of choledocholithiasis
RUQ/epigastric pain, N/V, jaundice
cause of jaundice
bilirubin is not excreted and instead seeps into bloodstream
hepatopancreatic ampulla
where pancreatic duct joins bile duct
how can pancreatitis result from gallstone
if the stone lodges in the major duodenal papilla, causing bile to back up into the pancreatic duct
pancreas location
posterior wall of lesser sac
parts of pancreas
head, neck, body, tail
pancreas head location
c-shaped curve of duodenum
path of pancreatic exocrine secretions (other than pancreatic duct)
accessory pancreatic duct to minor duodenal papilla to duodenum
location of spleen
posterolateral to stomach
spleen is connected to stomach via the
gastrosplenic ligament
spleen is connect to left kidney via the
splenorenal ligament
___contributes to the anterior roof of the inguinal canal
internal oblique
covering of spermatic cord
cremasteric fascia and muscle
where does the spermatic cord emerge from
behind lower part of internal oblique
course of spermatic cord
passes inferior to transversus abdominis and carries a layer of transversalis fascia
inguinal hernia definition
protrusion of abdominal contents (usually intestine covered by peritoneum and extraperitoneal fat) into some part of the inguinal canal
indirect inguinal hernia
does not pass directly through abdominal wall
indirect inguinal hernia course
herniating mass enters deep inguinal ring, transverses the inguinal canal, and emerges at the superficial ring
coverings of herniating mass in indirect inguinal hernia
cremasteric fascia and muscle
internal spermatic fascia
transversalis fascia
direct inguinal hernia
pushes directly through posterior wall of inguinal canal medial to the inferior epigastric artery
course of direct inguinal hernia
after emerging into inguinal canal, it traverses the medial end of the canal, and emerges at the superficial ring
____can progress to the scrotum, but ____ usually do not
indirect inguinal hernias, direct inguinal hernias
areas of weakness in the posterior aspect of anterior abdominal wall (inferior)
deep inguinal ring, femoral ring, Hesselbach’s triangle, supravesical fossa
first veins to receive blood in portal system
portal tributaries
capillaries in liver
liver sinusoids
anastomoses between portal and systemic circulation are called
portosystemic anastomoses
purpose of portosystemic anastomoses
to allow blood to return to the heart via the systemic circulation when a portal vein is occluded
locations of 3 major portosystemic anastomoses
lower esophagus, rectum, umbilical region
is the abdominal aorta intraperitoneal or retroperitoneal
retroperitoneal
where does abdominal aorta start
T12 at the aortic hiatus
paired branches of the abdominal aorta
middle adrenal, renal, gonadal, inferior phrenic, lumbar
retroperitoneal organs
suprarenal glands, aorta/IVC, duodenum (last 2/3), pancreas, ureters, colon (ascending and descending), kidneys, esophagus, rectum
terminal branches of abdominal aorta
common iliac arteries
most common location of abdominal aortic aneurysm
IMA
major causes of AAA
HTN, atherosclerosis
symptom of ruptured AAA
sharp, tearing back pain
systemic venous system aka
caval system
common iliac vein is formed by
internal and external iliac veins
where is common iliac vein formed
pelvic brim
what drains into IVC
gonads, kidneys, posterior abdominal wall, liver, diaphragm
IVC drains into right atrium just after receiving
hepatic veins
3 major branches of celiac trunk
common hepatic, left gastric, splenic
what does left gastric supply
lesser curvature
major branch of left gastric
esophageal
3 major branches of common hepatic artery
proper hepatic, right gastric, gastroduodenal
what does right gastric artery supply
lesser curvature
what does gastroduodenal artery supply
first part of duodenum
2 major branches of gastroduodenal artery
right gastroepiploic, pancreaticoduodenal
what does right gastroepiploic artery supply
greater curvature
what are 2 major branches of the splenic artery
left gastroepiploic, short gastrics
what does the left gastroepiploic artery supply
lesser curvature
what do the short gastrics supply
fundus and top part of lesser curvature
what anastomosis is responsible for caput madusae
paraumbilical and short epigastric veins
what anastomosis is responsible for esophageal varices
left gastric and esophageal veins
what anastomosis is responsible for hemorrhoids
superior and inferior rectal veins
ampulla of vater aka
hepatopancreatic ampulla
what structure can be compressed by SMA after rapid weight loss
third part of the duodenum
2 ligaments that make up the lesser omentum
gastrohepatic, hepatoduodenal
which ligament contains the portal triad
hepatoduodenal
retroperitoneal anastomosis for portal system
retroperitoneal/lumbar veins, colic veins