Duodenmum Flashcards
Duodenum is ____ cm long
25cms
It starts and ends at :
Begins at the pylorus @ Transpyloric plane 2.5cms right of midline and ends at duodenojejununal junction 2.5cms left of midline just below transpyloric plane
The ‘C’ shape of duodenum encloses _____
The head of pancreas
Duodenum is located at which level in abdominal cavity :
Above the level of umbilicus at L1 L2 L3 Vertebrae
Parts of Duodenum :
- Superior ( First Part ) : 5cms
- Descending ( Second Part ) : 7.5cms
- Horizontal ( Third Part ) : 10cms
- Ascending ( Fourth Part ) : 2.5cms
The course of First Part :
Begins at the Pylorus from where it goes upwards and backwards towards the right side of vertebrae till it reaches the neck of gall bladder from where it curves downwards to form the 2nd Part ( Superior Duodenal Flexure )
The Features of First Part :
- The first part of duodenum is partly retroperitoneal
- It develops from foregut
- It is freely mobile and distensible
- Has no circular folds in the lumen in the first 2.5cms
- Site for duodenal ulcer
- Supplied by branches of celiac artery
Relations of First Part :
Anteriorly : Quadrate lobe of liver ; Gall Bladder
Posteriorly : Portal vein, Bile duct, Gastroduodenal Artery
Superiorly : Epiploic Foramen
Inferiorly : Head and neck of pancreas
The Course of Second Part :
Begins at superior duodenal flexrue and moves downwards in front of medial part of Right Kidney till the lower border of L3 Vertebrae from where it curves to left forming Inferior Duodenal Flexure
Features of First Part :
- Upper Half Develops from Foregut and Lower Half Develops from Midgut
- Lies Behind Transverse Colon
- Receives Bile Duct and Chief and Accessory Pancreatic Duct
- Only part of intestine supplied by double row of vasa recta arising from ant. and post. pancreaticoduodenal arterial arcades
Relations of Second Part :
Anterior : Rigth lobe of Liver ; Gall Bladder; Transverse Colon and Mesocolon
Posterior : Right Kidney and Right Renal Vessels; and Right Part of IVC and Right Psoas Major Muscle
Medially : Head of Pancreas
Laterally : Ascending Colon; Right Colic Flexure ; Right Lobe of Liver
The Course Of Third Part :
Runs horizontally from Inf. Duodenal Flexure at the level of lower border of L3, in front of IVC And then takes a smooth curve upwards
Relations of Third Part :
Anterior : Root Of Mesentery, Coils of Jejunum, Superior Mesenteric Arteries
Posterior : Right Psoas major muscles; Rt. Ureter , IVC, Abdominal Aorta and Rt Gonad Vessels
Superior : Head of Pancreas with Unicate process
Inferior : Coils of Jejunum
Course of Fourth Part :
From the third part it runs upwards on the left of Abdominal Aorta till the upper border of L2 from where it comes forwards i.e ventrally to continue as jejunum
Relations of Fourth Part :
Anterior : Transverse Colon and Mesocolon
Posterior : Lt Psoas Major, Lt . Gonad Vessels , Inferior Mesenteric Artery
Superior : Body of pancreas
On Left : Lt. Kidney and Ureter
On Right : Abdominal Aorta