Organs Of GI Tract Flashcards
Where does the thoracic esophagus enter the stomach?
T11 at cardiac orifice
Where is the esophageal hiatus located?
T10
Where is the IVC located?
aorta?
T8
T12
What is it called when the esophageal hiatus weakens and the cardia herniated into the thorax?
Sliding hiatal hernia
What happens in a paraesophageal hiatal hernia?
The fund us of stomach herniated next to esophageal hiatus NOT the esophagus
Where is the left end of the stomach fixed?
Right end?
T10-11
L1-2
How long is the duodenum and what shape is it?
Where is it located?
10 inches, C-shaped
L1-4
What surrounds the 1st part of the duodenum and holds it in place?
What part of the pancreas is inferior to this part?
Hepatoduodenal ligament
Head of the pancreas
Which part of the duodenum is being described?
Head of the pancreas is superior
Jejunum is anterior and inferior
The superior mesenteric artery and vein cross the anterior surface
3rd part
What part of the duodenum is being described?
Root of mesentery and Jejunum are anterior
Not covered by parietal peritoneum
Left margin of aorta is posterior
4th
Which part of the duodenum is being described?
Funds of gall bladder, R lobe of liver, transverse colon are all anterior
R kidney and ureter are posterior
Head of pancreas is medial
Secondarily Retroperitoneal
2nd
What holds in place the 4th part of the duodenum?
Suspensory ligament of the duodenum (of Trietz)
Where does the suspensory ligament anchor the 4th part of the duodenum to?
R crus of the diaphragm
How long is the Jejunum and ileum?
20 ft
Where does the Jejunum end?
Ileo-cecal valve
Describe the following of the Jejunum: Length Arcades Vasa recta Vascular Diameter Plicae
8 ft Simple Long vasa recta more vascular Greater diameter, thicker More Plicae
Describe the following of the ileum: Length Arcades Vasa recta Vascular Diameter Plicae
12 ft Compound Short recta Less vascular Smaller diameter, thinner Fewer Plicae
What is Meckel’s diverticulum a feature of?
Give characteristics
Ileum
2% population, 2 ft from ileo-cecal junction, 2 different types of epithelia (gastric and pancreatic), within 2 years of life
What is Meckel’s diverticulum a remnant of?
Vitelline duct
Where does THE mesentery attach?
Jejunum and ileum to posterior body wall
What are the functions of the large intestine?
Fecal formation
Transport and evacuation
Water absorption
Mucus secretion
Where is the vermiform appendix attached?
Postero-medial part of the cecum
Which parts of the colon are secondarily Retroperitoneal?
Ascending and descending
Where is the rectum located?
Between the sigmoid colon and anal canal
What is the anorectal line?
Is the rectum above or below it?
Line joining the tops of the anal columns
Above
What is the fx of the puborectalis muscle?
Defecation
What is the Pectinate line?
Is it lower or higher than the anorectal line?
Line joining inferior ends of the anal valves
Lower
What artery supplies above the Pectinate line?
Below?
Superior rectal
Middle and inferior rectal
What nerve supplies above the Pectinate line?
Below?
Inferior hypogastric plexus
Inferior rectal n.
What type of epithelium is above the Pectinate line?
Below?
Simple columnar
Stratified squamous
What embryologic tissue supplies above the Pectinate line?
Below?
Endoderm
Ectoderm
What lymph drains above the Pectinate line?
Below?
Internal iliac LN
Superificial inguinal LN
Retroperitoneal structures SAD PUCKER:
Suprarenal glands Aorta and IVC Duodenum (2-4) Ureters Colon (asc./desc.) Kidney Esophagus Rectum
Where does the spleen develop from?
Dorsal mesentery
Is the diaphragm posterior or anterior to the spleen?
Are the stomach, left colic flexure and tail of the pancreas posterior or anterior to the spleen?
Posterior
Anterior
What is inferior to the spleen?
Left kidney and phrenicolic ligament
Where is the pancreas located?
What type of peritoneum?
L1-2
Retroperitoneal (mostly secondarily)
Where is the superior mesenteric artery and vein located in relation to the neck of the pancreas?
Posterior
Where is the tail of the pancreas located?
Against the spleen
Where are the IVC and aorta located in relation to the pancreas?
Posterior to the body
Where is the stomach located in relation to the pancreas?
Anterior
Where is the duodenum in relation to the pancreas?
Superior, right, and inferior to the head
Where does the transverse colon lie in relation to the pancreas?
Anterior and inferior
Where does the pancreas develop from?
Ventral bud in ventral mesentery
Where does the major pancreatic duct join the duodenum?
What does it form?
2nd part
Major duodenal papilla (more inferior)
What is the falciform ligament?
Double layer of peritoneum that connects the liver to the anterior wall
What is the fetal remnant of the ligamentum venosum?
Ductus venosus
What is the round ligament (ligamentum teres) a remnant of?
Umbilical vein
Portal triad?
PPB
Proper hepatic artery
Portal vein
Bile duct
Where does the gall bladder contact the anterior abdominal wall?
Midclavicular line at the 9/10th costal cartilage located on the transpyloric line
What is the lesser omentum in contact with?
Hepatoduodenal and hepatogastric ligament
What forms the bile duct?
Cystic and common hepatic ducts
Where does the thoracic esophagus pierce the diaphragm?
T10
Where is the critical point of Sudeck?
Area on colon where lowest sigmoid artery has poor anastomoses with superior rectal artery
What kind of innervations supplies the tissues superior to the Pectinate line?
Parasympathetic to S2-4
Detail the length of the 4 parts of the duodenum
1 and 4 are 2 inches
2 and 3 are 3 inches