Definitions

columnar-epithelium

Simple columnar epithelium

A simple columnar epithelium is a columnar epithelium that is uni-layered. In humans, a simple columnar epithelium forms a lining in the uterus and in most organs of the digestive tract including the stomach, small intestine, and large intestine.

Simple columnar epithelia are further divided into two categories: nonciliated and ciliated.

Nonciliated

Nonciliated columnar epithelia do not have cilia, and are found in the gastrointestinal tract and the gallbladder where they perform secretion and absorption.

~usually absorbs through the digestive system ~located in the stomach and intestines,gallbladder, and ecretory ducts of some glands. ~more function, more tissue, more cytoplasm ~ nucleus is closer to the basal surface ~ absorbs; seceretion of mucus enzymes and other substances; cillated type propels by cilary action.

Ciliated

Ciliated columnar epithelia move mucus and other substances via cilia, and are found in the upper respiratory tract, the Fallopian tubes, the uterus, and the central part of the spinal cord.

Ciliated columnar epithelium lines the lumen of the uterine tube, where currents generated by the cilia propel the egg cell toward the uterus.

Additional images

References

External links

  • "Gall bladder" - Simple columnar epithelium
  • - Uterine tube lumen

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