SMALL INTESTINE

THEsmall intestine

by wiktoria mazepa

the small intestine

fun facts

functions

parts of the organ

structure

location in the body

shape and size

• Located in the central and lower abdominal cavity
• Usually from 6 to 7 metres long - longest part of the digestive system
• Approximately 3 cm in diameter
• Surface area: up to 500 square metres

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general information

LOCATION IN RELATION TO OTHER ORGANS

1. Mucosa
2. Submucosa
3. Muscle layer
4. Serosa

STRUCTURE

• Villi increase absorption area 23 times
• Microvilli increase absorption area 600 times

Villi and microvilli

1. the duodenum2. the jejunum3. the ileum

PARTS OF THE SMALL INTESTINE

• 'C' shaped, about 25 cm long, widest in diameter
• runs from pyloris to duodenojejunal junction
• wraps around the head of the pancreas
• receives semi-digested food from the stomach and digestive juices from the pancreas and the liver

THE DUODENUM

• second part of the small intestine, about 2.5 metres long
• thick intestinal walls
• red in colour
• products of the digestion are absorbed from here into the bloodstream

Tempor Labore

THE JEJUNUM

• last and the longest part of the intestine
• about 3 metres long
• contains villi similar to the jejunum but its walls are narrower and thinner
• absorps mainly vitamin B12, bile acids and remaining nutrients
• pink in colour

THE ILEUM

• a double layer of peritoneum in the abdominal cavity
• attaches the jejunum and the ileum to the abdominal wall
• contains fat, blood vessels and nerves
• distinguished as an organ itself in the XXI centrury

THE MESENTERY

Small Intestinal Bacterial Overgrowth (SIBO)

migration of the large intestine's bacteria to the small intestine

Irritable Bowel syndrome (IBS)

disfuction of the brain-intestine connection

CLINICAL RELATIONS

FACT 4

FACT 3

FACT 2

FACT 1

INTERESTING FACTS

Sources:

• https://www.kenhub.com/en/library/anatomy/the-small-intestine
• https://teachmeanatomy.info/abdomen/gi-tract/small-intestine/
• https://www.britannica.com/science/small-intestine
• https://www.simplemost.com/mesentery-new-organ-calvin-coffey/

• images:google imageshttps://smart.servier.com/category/anatomy-and-the-human-body/digestive-system/

thanks