4-34 Connective tissue

LOOSE CONNECTIVE TISSUE AND DENSE IRREGULAR CONNECTIVE TISSUE
The lining epithelium of the intestines is supported by a layer of loose connective tissue, highlighted in red. This connective tissue contains many cells and extracellular matrix. Fibers are sparse and not easy to identify in this tissue.
The connective tissue located immediately beneath the lining epithelium of organs of the digestive, respiratory, and urinary systems is often called the lamina propria. The epithelium and lamina propria Together they constitute the mucosal layer or simply mucosa of these organs.
A thin layer of smooth muscle separates the lamina propria from the connective tissue located beneath the muscular layer.
In the image this layer of dense irregular connective tissue under the muscle layer becomes highlighted in light blue. It contains many not well organized collagen fibers and has fewer cells than the loose conective tissue of the lamina propria.

Small intestine. Staining: HE. Magnification: medium.

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