Pay attention to the following details:
In the epithelium, the cell nuclei are clearly visible. The acidophilic (pink) areas around each nucleus are the cytoplasm of the epithelial cells. There is almost no space between the cells, the cells are closely juxtaposed.
The nuclei in the connective tissue, are quite far apart from each other. The cytoplasm of the cells that contain these nuclei is seems thin and is often barely visible. The areas between the cells are spaces filled by extracellular matrix – there are many pink collagen fibers of different sizes and thicknesses – and, in addition, “empty” spaces that probably result from technical artifacts dua to the histological techniques and that resulted is a retraction of components of the extracellular matrix.
There are no blood vessels in the epithelium. but there is one in the connective tissue.
In the epithelia that line the cavities of the digestive, respiratory and urinary systems, this layer of connective tissue is also called lamina propria.
Covering the moist surfaces of the inner cavities of internal organs, the asoctiation of an epithelium + the lamina propria is called mucous membrane, a term often simplified to mucosa (as is: oral mucosa, gastric mucosa). The epithelial layer and its underlying connective tisue Covering the surface of organs placed in the large cavities of the body (toracic and abdominal cavities)
Check the