GI booklet Flashcards
What are the nine compartments of the abdomen?
Right hypochondriac | Epigastric | Left hypogastric
Right Lumbar | Umbilical | Left lumbar
Right iliac |Hypogastric | left Iliac
Iliac may be called inguinal
Hypogastric may be called suprapubic
What lines divide the abdomen into four quadrants?
Trans pyloric line
Midline
What lines divide the abdomen into 9 regions?
Right/left interclavicular lines
Trans tuberculum line
Subcostal line
What organs are found in the right hypochondriac region?
Liver
Gallbladder
What organs are found in the left hypochondriac region?
Spleen
Pancreas
Kidney
What organs are found in the epigastric region?
Stomach
Liver
Pancreas
What organs are found in the right lumbar region?
Kidney
Asc colon
What organs are found in the umbilical region?
Transverse colon
Jenunum/duodenum/ileum
What organs are found in the left lumbar region?
Desc colon
Kidney
What organs are found in the right iliac region?
Caecum
Appendix
Asc colon
What organs are found in the hypogastric region?
Sigmoid colon
Rectum
Bladder
What organs are found in the left iliacregion?
Rectum
Desc colon
What is the action of the external oblique?
Abducts trunk
Rotates trunk
What is the innervation of the external oblique?
T7-T12
What is the action of the internal oblique?
Abducts trunk
Rotates trunk
What is the innervation of the internal oblique?
T7-T12, L1
What is the action of the rectus abdominis?
Flexes trunk
What is the innervation of the rectus abdominis?
T7-T12
What is the action of the transverse abdominis?
Compresses abdominal contents
What is the innervation of the transverse abdominis?
T7-T12, L1
What is the rectus sheath?
Aponeurosis of the adominal wall muscles
>External ob
>Internal ob
>Transverse abdominis
How does the rectus sheath differ above and below the umbilicus?
Above the umbilicus it is thicker and more muscular than below
What is the level of the umbilicus?
L1
What is the dermatome of the umbilicus?
T10
What bony points is the inguinal ligment attached to?
Pubic tubercle
Anterior superior iliac spine
What makes up the anterior wall of the inguinal canal?
Aponeurosis of external oblique
Superficial inguinal ring
What makes up the posterior wall of the inguinal canal?
Transveralis fascia
Deep inguinal ring
Conjoint tendon
What makes up the roof of the inguinal canal?
Transveralis fascia
Aponeurosis of external oblique
What makes up the floor of the inguinal canal?
Inguinal ligament
Lacunar ligament
Iliopubic tract
What is the relationship of the deep inguinal ring to the inferior epigastric vessels?
Superior and lateral to them
What is the relationship of the superficial ring to the pubic tubercle?
It lies superolaterally to it
What are the contents of the male inguinal canal?
Spermatic cord: >Vas deferens >Testicular veins/arteries Ilioinguinal nerve Genital branch of genitofemoral nerve
What are the contents of the female inguinal canal?
Round ligament
Ilioinguinal nerve
Genital branch of genitofemoral nerve
What are the types of inguinal hernia?
Direct
Indirect (most common)
What is an indirect hernia?
Congenital weakness of deep inguinal ring
Allows abdominal contents to enter into inguinal canal + out deep ring
What is a diret inguinal hernia?
Abdominal contents pass through weak spot in muscles of posterior wall
Enter through superficial inguinal ring
What is a femoral hernia?
Below inguinal ligament
>Abdominal contents pass into weak area of posterior femoral canal
More common in females
What are umbilical hernias?
Abdominal contents through weakness of umbilicus
Acquired rather than congenital in adults
What are the four layers of the GI tract?
Mucosa >Epithelium >Lamina propria >Muscularis mucosae Sub mucosa Muscularis propria Serosa/adventitia
What are the subdivisions of the peritoneum?
Parietal
Visceral
What is the peritoneal cavity?
Continuous area between parietal/visceral linings
What are the two major divisions of the peritoneal cavity?
Greater sac
Omental bursa
How do the two sacs of the peritoneal cavity communicate?
Foramen of windslow
Where is the foramen of windslow found?
Behind stomach + liver
What organs are retroperitoneal?
SCV/Aorta Adrenal glands Duodenum(1st 1/3) Pancreas (not tail) Ureters Colon (asc/desc) Kidneys Oesophagus Rectum (last 2/3s)
What organs are intraperitoneal?
Stomach Appendic Liver Transverse colon Duodenum (last 2/3s) Small intestines Pancreas - tail Rectum (upper 1/3) Sigmois Spleen
What is present in the peritoneal cavity?
Peritoneal fluid
Which layer of the peritoneum are mroe sensitive to pressure, pain heat and cold?
Parietal
What are the attachments of the greater omentum?
Greater curvature of stomach
Transverse colon
What are the attachments of the lesser omentum?
Liver
Stomach - lesser curvature
How does the greater omentum localise infection?
The inflammatory exudate causes the omentum to adhere to the site of infection
Causes it to wrap around infected organ
Thus containing the infection
Where does the parietal peritoneum get its innervation?
T7-12 + L1
>Somatic nerves
>Pain easily localised
Where does the visceral peritoneum get its innervation?
Autonomic nerves
>Pain often referred
What muscles are found on the posterior abdominal wall?
Psoas major
Psoas minor
Quadratus lumborum
What organs/tubes are found on the psoterior abdominal wall?
Kidneys Desc/asc colon Pancreas Duodenum Rectum Oesphagus
What are the main vesels int he psoterior abdominal wall?
IVC
Aorta
Ureters
What are the main nerves of the posterior abdominal wall?
Lumbar plexus
Sacral plexus
What are the three openings of the diaphgram?
Aortic hiatus
Carval hiatus
Oesophgeal hiatus
What are the three main branches of the abdominal aorta that supply the gut?
Coeliac trunk
Superior mesenteric
Inferior mesenteri artery
At what level does the abdominal aorta divide into 2 common iliac arteries?
L4
What are the two main tributaries to the IVC?
Common iliac veins
Herpatic veins
What is the vertebral level of the coeliac trunk?
T12
What is the vertebral level of the superior mesenteric artery?
L1
What is the vertebral level of the inferior mesenteric artery?
L3
What structures arose from the foregut?
Abdominal oesophagus Stomach Duodenum first 1/3 Liver Pancreas
What organs arose from the midgut?
last 2/3s of duodenum
Ileum/jejnum
Asc colon
Pancreas
What organs arose from the hindgut?
Desc colon
Anal canal
Rectum
Sigmoid colon
> Everything after left colonic flexture
What artery supplies the foregut?
Coeliac trunk
What artery supplies the midgut?
Superior mesenteric artery
What artery supplies the hindgut?
Inferior mesenteric artery
What two organs are part of the fore/mid gut that are not part of the GI tube?
Lung
Spleen
What is a portal system?
Blood from organs in series
What veins make up the portal vein?
Splenic vein Superior mesenteric (inferior already has tributed to this)
What are the 4 sites of portocaval anastomosis?
Distal oesophagus
Umbilical
Distal rectum
Liver
Where does blood superior to the diaphgram and inferior to the pelvic floor dtain?
Into the systemic venous system
What is the significance of the portocaval anastomoses?
If portal hypertension, then these swell and give clinical signs
>Haemmarhoids
Blood in oesophagus
>Caput medusa
Can show in excess alcohol
what is the sympathetic innervation to the abdominal viscera?
Abdominopelvic splanchnic nerves (greater, lesser least)
Prevertebral sympathetic ganglia
Abdominal aortic plexuses
what is the parasympathetic innervation to the abdominal viscera?
Anterior and posterior vagal trunks (vagus nerve)
Pelvic splanchinic nerves (S2-4)
How does the ANS affect GI secretion?
Parasympathetic increases
Sympathetic decreases
How does the ANS affect peristalsis?
Parasympathetic increaes
Symp decreases
How does the ANS affect blood vessesls?
Parasympatethtic causes vasodilation
Symp - vasoconstriction
What is the functional difference between the greater/lesser/least splanchnic nerves and pelvic splanchnic nerves?
Greater/lesser/least are sympathetic
Pelvic are para
What is the level of the kidneys?
T12-L3
What is the anterior to posterior arrangement of the structures leaving/entering the hilum of the kidney?
Vein
Artery
Ureter
What type of gland is the suprarenal gland?
Endocrine
What is the term for the expanded upper part of the ureter?
Renal pelvis
What are the three constrictions of the ureters?
Pelviureteric junction
Common iliac artery
Bladder
What are the three constrictions of the oesophagus?
Cervical
Thoracic
Diaphragmatic
What structures transverse the oesophageal hiatus?
Oesophagus
Phrenic nerve
vagus nerve
What is the blood/lymphatic supply of the abdominal oesophagus?
Left gastric artery/vein
Thoracic duct - lymphatics
>Drained by gastric lymph nodes
What are the two origices of the stomach?
LOS
Pyloric
What is the pyloric sphincter?
Sphincter at the bottom of the stomach
What is the function of the pyloric sphincter?
Allows food into duodenum by controlling discharge
What forms the pyloric sphincter?
The thickening of the muscularis externus
What forms the gastric folds?
Gastric mucosae
What structures form the stomach bed?
Left dome of diaphgram Pancreas Spleen Left kidney Transverse colon Colon Left suprarenal gland
What is the lymphatic drainage of the stomach?
Superior gastric nodes
Suprapyloric nodes
Inferior gastric nodes
Pancreatic nodes
All four of the stomach lymphatic nodes drain into what lymph system?
Coeliac group
Into intestinal
Into cisterna chyli
Into thoracic duct
How does the vagus nerve affect the stomach?
Decreaes pyloric emptying
Increaes gastric secretion
What are the three parts of the small intestine?
Duodenum
Jejunum
Ileum