LOOSE CONNECTIVE TISSUE AND DENSE IRREGULAR CONNECTIVE TISSUE
The lining epithelium the intestine is supported by a layer of loose connective tissue, highlighted in red. It is formed by many cells and extracellular matrix containing collagen fibers.
The connective tissue underlying the lining epithelium of organs of the digestive, respiratory, and urinary systems is often called the lamina propria. The epithelium and lamina propria together constitute the mucosal layer or simply mucosa of these organs.
The connective tissue underlying the lining epithelium of organs of the digestive, respiratory, and urinary systems is often called the lamina propria. The epithelium and lamina propria together constitute the mucosal layer or simply mucosa of these organs.
Observe under the mucosa a layer of dense, irregular connective tissue that becomes highlighted in light blue. It is formed of a large amount of collagen fibrils and fewer cells than the loose conective tissue.
A thin layer of smooth muscle separates these two connective tissues.

