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Lamina propria

 

 
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Lamina propria
 
 
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The lamina propria is a constituent of the moist linings known as mucous membranes or mucosa, which line various tubes in the body (such as the respiratory tract, the gastrointestinal tract, and the urogenital tract).

The lamina propria (more correctly lamina propria mucosae) is a thin layer of loose connective tissue
Areolar connective tissue

Areolar tissue exhibits interlacing, loosely organized fibers, abundant blood vessels, and a lot of seemingly empty space. Its fiber run in random directions and are mostly collagenous, but elastic and reticular fibers are also present....
 which lies beneath the epithelium
Epithelium

In biology and medicine, epithelium is a Biological tissue composed of cell s that line the cavities and surfaces of structures throughout the body....
 and together with the epithelium constitutes the mucosa.






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The lamina propria is a constituent of the moist linings known as mucous membranes or mucosa, which line various tubes in the body (such as the respiratory tract, the gastrointestinal tract, and the urogenital tract).

The lamina propria (more correctly lamina propria mucosae) is a thin layer of loose connective tissue
Areolar connective tissue

Areolar tissue exhibits interlacing, loosely organized fibers, abundant blood vessels, and a lot of seemingly empty space. Its fiber run in random directions and are mostly collagenous, but elastic and reticular fibers are also present....
 which lies beneath the epithelium
Epithelium

In biology and medicine, epithelium is a Biological tissue composed of cell s that line the cavities and surfaces of structures throughout the body....
 and together with the epithelium constitutes the mucosa. As its Latin name indicates it is a characteristic component of the mucosa, "the mucosa's own special layer". Thus the term mucosa or mucous membrane always refers to the combination of the epithelium plus the lamina propria.

The lamina propria contains capillaries and a central lacteal
Lacteal

A lacteal is a lymphatic that absorbs dietary fats in the villi of the small intestine.The combination of fat and lymph in the lacteals is milky in appearance and called chyle....
 (lymph vessel) in the small intestine
Small intestine

In vertebrates, including mammals, reptiles, birds, and bony fish, the small intestine is the part of the gastrointestinal tract following the stomach, and is where the vast majority of digestion takes place....
, as well as lymphoid tissue. Lamina propria also contains glands with the ducts opening on to the mucosal epithelium, that secrete mucus and serous secretions.

See also

  • Submucosa
    Submucosa

    In the gastrointestinal tract, the submucosa is the layer of dense irregular connective tissue that supports the mucosa, as well as joins the mucosa to the bulk of underlying smooth muscle ....
  • Basal lamina
    Basal lamina

    The basal lamina is a layer of extracellular matrix on which epithelium sits and which is secreted by the epithelial cells. It is often confused with the basement membrane, and sometimes used inconsistently in the literature, see below....
     (also known as Lamina densa)


External links

- "Digestive System: Alimentary Canal - esophagus " - "Connective Tissue: lamina propria; loose connective tissue " - "Mammal, whole system (LM, Low)"