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Questions and Answers
What is the length of the duodenum?
What is the length of the duodenum?
Which part of the duodenum is covered on both surfaces with peritoneum?
Which part of the duodenum is covered on both surfaces with peritoneum?
What anatomical structure is located posteriorly to the second part of the duodenum?
What anatomical structure is located posteriorly to the second part of the duodenum?
Which region of the duodenum is considered retroperitoneal?
Which region of the duodenum is considered retroperitoneal?
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Where does the first part of the duodenum begin?
Where does the first part of the duodenum begin?
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In relation to the vertebral column, how does the third part of the duodenum run?
In relation to the vertebral column, how does the third part of the duodenum run?
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What is the anatomical relationship of the duodenum to the ascending colon?
What is the anatomical relationship of the duodenum to the ascending colon?
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At which level of the lumbar vertebrae does the first part of the duodenum occur?
At which level of the lumbar vertebrae does the first part of the duodenum occur?
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Study Notes
Anatomy of the Duodenum
- The duodenum is approximately 10 inches (25 cm) long and forms a C-shape, connecting the stomach to the jejunum.
- It curves around the head of the pancreas and receives the bile and pancreatic ducts' openings.
Structure and Coverage
- The first inch (2.5 cm) resembles the stomach due to peritoneal coverage on both its anterior and posterior surfaces.
- Attached to the upper border are the lesser omentum and the greater omentum at the lower border; the lesser sac is located behind this segment.
- The majority of the duodenum is retroperitoneal, being only partially covered by peritoneum except at two regions (1st and 4th parts).
Description of the Parts
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1st Part: Begins at the pylorus, extends upward and backward along the transpyloric plane, aligning with the 1st lumbar vertebra.
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2nd Part: Positioned vertically downward in front of the right kidney's hilum, located on the right side of the 2nd and 3rd lumbar vertebrae.
- Anterior Relationship: Fundus of the gallbladder, right liver lobe, transverse colon, and coils of the small intestine.
- Posterior Relationship: Hilum of the right kidney and the right ureter.
- Lateral Relationship: Ascending colon, right colic flexure, and right liver lobe.
- Medial Relationship: Head of the pancreas, bile duct, and main pancreatic duct.
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3rd Part: Runs horizontally to the left on the subcostal plane, passing in front of the vertebral column, and aligns with the lower margin of the head of the pancreas.
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4th Part: Ascends on or just to the left of the abdominal aorta, extending from the end of the third part to the upper border of the L2 vertebra, where it turns forward.
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Description
This quiz provides an overview of the anatomy and functions of the duodenum. It describes the structure's connections to the stomach and jejunum, as well as its role in the digestive system. Test your knowledge of this crucial digestive segment!
