The mucosa of the small intestine is lined by a simple columnar epithelium which consists primarily of absorptive cells (enterocytes), with scattered goblet cells and occasional enteroendocrine cells.

columnar epithelial

The mucosa of the colon is lined by a simple columnar epithelium with a thin brush border and numerous goblet cells. Note that there areno plicae or villi. The crypts of Lieberkühn are straight and unbranched and lined largely with goblet cells.

The wall of the large intestine is lined with simple columnar epithelium. Instead of having the evaginations of the small intestine ( villi ), the large intestine has invaginations (the intestinal glands). In the intestine, the digestive enzymes are not secreted by the cells of the intestine.

The main function of simple columnar epithelial cells are protection. For example, the epithelium in the stomach and digestive tract provides an impermeable barrier against any bacteria that could be ingested but is permeable to any necessary ions. This function is especially important in the colon.

The key difference between simple stratified and pseudostratified epithelial tissue is that simple epithelial tissue has only one cell layer while stratified epithelial tissue has several cell layers and pseudostratified epithelial tissue appears to have several cell layers despite having only one cell layer.

The shape of the simple columnar epithelium cells are tall and narrow giving a column like appearance. the apical surfaces of the tissue face the lumen of organs while the basal side faces the basement membrane. the nuclei are located closer along the basal side of the cell.

The important functions of the simple cuboidal epithelium are secretion and absorption. This epithelial type is found in the small collecting ducts of the kidneys, pancreas, and salivary glands.

Epithelial tissues are widespread throughout the body. They form the covering of all body surfaces, line body cavities and hollow organs, and are the major tissue in glands. They perform a variety of functions that include protection, secretion, absorption, excretion, filtration, diffusion, and sensory reception.

Simple columnar epithelium consist of a single layer of cells that are taller than they are wide. This type of epithelia lines the small intestine where it absorbs nutrients from the lumen of the intestine. Simple columnar epithelia are also located in the stomach where it secretes acid, digestive enzymes and mucous.

Basement membrane Page 19 All epithelia rest on a basement membrane. All epithelial cells are attached on their basal surface to a basement membrane. The basement membrane provides some mechanical support as it tethers together a sheet of epithelial cells.

Transitional epithelium is a stratified tissue in which the cells are all have a fairly round shape when the organ it lines is not distended (stretched out). The image shows the wall of the urinary bladder in the relaxed state (not distended).

These cuboidal cells have large, spherical and central nuclei. Simple cuboidal epithelia are found on the surface of ovaries, the lining of nephrons, the walls of the renal tubules, and parts of the eye and thyroid, along with the salivary glands. On these surfaces, the cells perform secretion and absorption.

1 : somewhat cubical. 2 : composed of nearly cubical elements cuboidal epithelium.

It is a single layer thick and made of cube-shaped cells. This type of tissue is found lining parts of the body such as the kidney tubules and walls of the respiratory bronchioles. The cells of simple cuboidal epithelium are specialized for diffusion and absorption.

one layer

Simple Squamous Epithelium Characteristics The squamous epithelial cells are characterized by being flat, possessing an oblong nucleus, and having a scale-like appearance. The cells are wider than they are tall and appear somewhat hexagonal when viewed from above.

The intestinal epithelium is the single cell layer that form the luminal surface (lining) of both the small and large intestine (colon) of the gastrointestinal tract….

The inner surface of the stomach is lined by a mucous membrane known as the gastric mucosa. The mucosa is always covered by a layer of thick mucus that is secreted by tall columnar epithelial cells.

simple columnar epithelium

Several cell types are present in the intestinal epithelium, including enterocytes, Paneth cells, goblet cells, and neuroendocrine cells (Figure 1). Enterocytes are the major cell type in intestinal epithelium.

The normal thickness of the small intestinal wall is 3–5 mm, and 1–5 mm in the large intestine. Focal, irregular and asymmetrical gastrointestinal wall thickening suggests a malignancy. Segmental or diffuse gastrointestinal wall thickening is most often due to ischemic, inflammatory or infectious disease.

Epithelial tissue

Enterocytes

Regions of the stomach

• The cardia is the first part of the stomach below the esophagus.
• The fundus is the rounded area that lies to the left of the cardia and below the diaphragm.
• The body is the largest and main part of the stomach.
• The antrum is the lower part of the stomach.

Enterocytes in the small intestine absorb large amounts of sodium ion from the lumen, both by cotransport with organic nutrients and by exchange with protons.

Lieberkühn