4 & 6- GI Organs Pt. 1 & 2 Flashcards
What are the GI organs and associated organs?
GI = Esophagus Stomach Small Intestine Colon Rectum Anal Canal
Associated = Spleen Pancreas Liver Gall Bladder
This abdominal plane is on the level of L1 and passes through the Pyloric Sphincter.
Transpyloric Plane
This abdominal plane is on the level of L2-3 and passes inferior to the costal margin.
Subcostal Plane
This abdominal plane is on the level of L5 and passes through the iliac tubercles.
Transtubercular Plane
This abdominal plane is on the level of S2 and passes through the ASIS.
Interspinous Plane
The esophagus passes through the _______ _______ at T10 vertebral level in the respiratory diaphragm to enter the abdomen. It turns sharply to the left of midline to enter the stomach at the _______ _______ at T11 vertebral level.
Esophageal Hiatus
Cardiac Orifice
This separates the esophagus from the fundus of the stomach.
Cardiac Notch
How far below the respiratory diaphragm does the esophagus extend?
1 inch
This is where the respiratory diaphragm effectively closes the inferior portion of the esophagus. It is not there anatomically, but is physiological.
Inferior Esophageal Sphincter
What are the esophageal constrictions?
Superior = Level of Cricoid Cartilage, juncture with pharynx (upper esophageal sphincter)
Middle = Crossed by Aorta and Left Main Bronchi (passes posterior to bronchi)
Inferior = Diaphragmatic sphincter by passing through Esophageal Hiatus
This type of hiatal hernia occurs when the cardia of the stomach is in normal abdominal position, but the peritoneum and fundus of the stomach are anterior to the esophagus. No regurgitation occurs.
Para-esophageal Hiatal Hernia
This type of hiatal hernia occurs when the esophagus, cardia of stomach, and fundus of the stomach protrude through the esophageal hiatus. Regurgitation occurs with this condition.
Sliding Hiatal Hernia
***Occurs especially when the patient lies down or bends over!
What is the volume of the stomach?
2-4 Liters
Where is the stomach located?
Commonly located in both RUQ and LUQ
***Also described in the epigastric, umbilical, and left hypochondrium regions
Where is the left end of the stomach fixed at?
Level of T10-11
Where is the right end of the stomach fixed at?
Level of L1
What are the parts of the stomach?
Cardia
Fundus
Body
Pylorus (including Pyloric Sphincter)
This part of the stomach is connected to the esophagus above and the body of the stomach below.
Cardia
This part of the stomach is superior to the Cardiac Orifice (junction with esophagus), at the level of the 5th rib. It rests against the left side of the diaphragm.
Fundus
This part of the stomach is the portion between the Fundus and Pylorus.
Body
This part of the stomach is the portion between the body of the stomach and the duodenum.
Pylorus
This is the wider portion of the Pylorus.
Pyloric Antrum
This is the narrow, distal portion of the Pylorus.
Pyloric Canal
This part of the Pylorus is normally closed. It regulates the flow of food into the duodenum.
Pyloric Sphincter
This is on the inferior border of the stomach and is where the Greater Omentum attaches.
Greater Curvature
***4-5x greater in length than Lesser Curvature!
This is on the superior border of the stomach and is where the Lesser Omentum attaches.
Lesser Curvature
What lies anterior to the stomach?
Anterior Abdominal Wall
Diaphragm
Left Lobe of Liver
What lies superior to the stomach?
Left dome of Diaphragm
What lies posterior to the stomach?
Lesser Sac (Omental Bursa) Pancreas Transverse Colon Transverse Mesocolon Left kidney Left suprarenal gland Spleen
This denervates the nerve supply to all of the stomach plus most of the GI tract and liver.
Truncal Vagotomy
This denervates branches of the Vagus N. going ONLY to the stomach.
Proximal Gastric Vagotomy
This specifically denervates the area of the stomach in which parietal cells are located (Fundus and Cardia).
Selective Proximal Vagotomy
The duodenum begins at the Pylorus and ends at the ________ ________ (flexure) at L2 vertebra. It’s shaped like a horseshoe and is molded around the head of the ________.
Duodenojejunal Junction
Pancreas
How long is the duodenum? What parts are intraperitoneal and retroperitoneal?
10 inches
1st inch is intraperitoneal, 9 inches are retroperitoneal
Describe the first part of the duodenum.
Length is 1 inch, most mobile part and is intraperitoneal.
Travels superior and posterior to the right.
Associated with Hepatoduodenal Ligament (Lesser Omentum), which contains the Portal V., Hepatic A., and Common Bile Duct.
This part of the duodenum is retroperitoneal and 3-4 inches long. It runs parallel and to the right of the Inferior Vena Cava.
2nd Part
The 2nd part of the duodenum contains the _________ ________, which is formed by the union of the common bile duct and the pancreatic duct.
Hepatopancreatic Ampulla (of Vater)
What are the internal features of the 2nd part of the duodenum?
Major Duodenal Papilla
Sphincter of Oddi
What opens at the Major Duodenal Papilla and Minor Duodenal Papilla?
Main Pancreatic Duct opens at Major Duodenal Papilla
Accessory Pancreatic Duct opens at Minor Duodenal Papilla
What lies medial to the 2nd part of the duodenum?
Head of Pancreas
What lies anterior to the 2nd part of the duodenum?
Gall Bladder (Fundus)
Right Lobe of Liver
Transverse Colon
What lies posterior to the 2nd part of the duodenum?
Right kidney
Ureter
This part of the duodenum is 4 inches and retroperitoneal. It travels transverse (crosses midline) from right to left.
3rd Part
What is anterior to the 3rd Part of the duodenum?
Superior Mesenteric A. and V.
Root of Mesentery
Jejunum
What is superior to the 3rd Part of the duodenum?
Head of Pancreas
This part of the duodenum is 1 inch and retroperitoneal. It ascends to the left side of the Aorta.
4th Part
The 4th Part of the duodenum joins with the jejunum at the _________ _________ (or flexure). A sharp bend occurs at this point where the duodenum joins the jejunum.
Duodenojejunal Junction
This is a suspensory muscle that attaches the 4th Part of the duodenum to the Posterior Abdominal Wall. It functions to widen the opening of this portion of the duodenum and anchors it to the right crus of the diaphragm.
Ligament of Treitz
What is located posteriorly to the 4th Part of the duodenum?
Left Margin of Aorta
Inferior Mesenteric V.
Psoas M.
This is defined as the proximal 2/5s of the small intestine and is located in the LUQ. It is intraperitoneal and held in place by the mesentery.
Jejunum
The jejunum possesses well-developed mucosal folds called _______ _______, which diminish in size from proximal to distal (they are completely absent in the distal ileum).
Plicae Circulares
In the jejunum, the amount of _______ in the mesentery increases from proximal to distal.
Fat
In the jejunum, the number of ________ arcades in the mesentery increases from proximal to distal. There are long ______ ______ that branch from these arcades.
Arterial Vasa Recta (Straight Arteries)
This part of the small intestine is located in the RLQ and is intraperitoneal. It’s held in place by the mesentery and is defined as the distal 3/5s of the small intestine.
Ileum
The ileum has compound vascular arcades with shorter ______ ______.
Vasa Recta (Straight Arteries)
This consists of 2 layers of peritoneum and attaches the jejunum and ileum to the posterior body wall.
Mesentery