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Structure Of Small Intestine In Detail. How Does It Differ From Large Intestine?

Referencing Styles : MLA | Pages : 1

Structure of small intestine

The small intestine is an organ within the digestive tract wherever most of the end absorption of nutrients and minerals from food takes place. It lies between the abdomen and huge intestine, and receives bile and digestive juice through the pancreatic to assist in digestion.

The small intestine has 3 distinct regions – the duodenum, jejunum, and ileum. The duodenum, the shortest, is wherever preparation for absorption through little finger-like protrusions referred to as villi begins. The small intestine is specialized for the absorption through its lining by enterocytes little nutrient particles that are antecedently digestible by enzymes within the small intestine. the most perform of the small intestine is to soak up vitamin B complex, bile salts, and no matter merchandise of digestion weren't absorbed by the small intestine.

Structure of Small Intestine:

The structure of the small intestine organ is comparable to the opposite organs within the digestive tract. There are four main layers: 

  • Mocosa (Innermost layer): Contains the epithelium, lamina propria  and muscularis mucosae.
  • Submucosa: Consists of two smooth muscle layers; the outer longitudinal layer and inner circular layer. The myenteric plexus lies between them.
  • Muscularis externa: Consists of two smooth muscle layers; the outer longitudinal layer and inner circular layer. The myenteric plexus lies between them.
  • Adventitia (Outermost layer): Comprised of loosely arranged fibroblasts and collagen, with the vessels and nerves passing through it. The majority of the small intestine adventitia is covered by mesothelium and is commonly called the serosa.

The small intestine is that the major spongy web site within the digestive tract, and thus includes a variety of modifications to assist its operate. The mucosa layer and connective tissue type giant numbers of folds (or plicae) organized in a very circular fashion within the lumen (therefore known as plicae circulars). Additionally, the plicae contain microvilli to additional increase the extent that will increase absorption.

How does small intestine differ from large intestine?

Both the small intestine and the large intestine are the most important part of the digestive system, the differ in their function and structure, following are the difference between the small intestine and the large intestine:

  1. The small intestine is 4.5-7.0 m in size long, but is narrow in width of around 3.5-4.5 cm only, whereas Large intestine measures around 1.5 m in size in length and width of 4-6 cm in diameter, and due to this broadness difference in the tubes of the large intestine and small intestine, they are named accordingly.
  2. Circular folds also called as ‘palicae circulares’ as present in the internal surface of the small intestine, whereas it is absent in large intestine.
  3. Peyers Patches which are the aggregations of lymphoid tissue present on the mucous membrane of the small intestine, while it is absent in large intestine.
  4. Taenia Coli and Hastura is absent from the surface of the small intestine, whereas they are present in the large intestine.
  5. Small intestine forms the layer of continuous bands of muscles around it, while Large intestine is reduced to three types of muscles bands called as taeniae coli.

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