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Small Intestine

Definition : - The part of intestine distal to the stomach at the pyloric sphincter and it ends at ileocaecal valve where the colon starts.5 metres longSituated in the abdominal cavitySurrounded by the colonParts : -Duodenum Jejunumileum. Structure : - Walls

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Small Intestine

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    1. Small Intestine

    2. Definition : - The part of intestine distal to the stomach at the pyloric sphincter and it ends at ileocaecal valve where the colon starts. 5 metres long Situated in the abdominal cavity Surrounded by the colon Parts : - Duodenum Jejunum ileum

    3. Structure : - Walls – 4 layers Peritoneum - a double layer of peritoneum wraps the small intestine – mesentery – the mesentery attaches the small intestine to the posterior abdominal wall. - the length of attachment is much shorter than the length of the intestine – so fan shape Blood vessels travel between the two layers of the mesentery and supply the intestine. Muscle layer – two layers of smooth muscle – outer longitudinal and inner circular muscle fibres – in between there are blood vessels – lymph vessels and nerve plexus called myenteric or Aurbach’s plexus.

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