Terminal bar is a histological term given to the unresolved group of junctional complexes that attach adjacent epithelial cells on their lateral surfaces: the Zonula Occludens, Zonula Adherens, Macula Adherens

Desmosome

A desmosome , also known as macula adherens , is a cell structure specialized for cell-to-cell adhesion...

 and Macula Communicans

Communicans

Communicans is a Latin word meaning "communicating". It is most commonly used in medical or biological terminology.* The rami communicans are connective spinal nerves that attach to the ganglion of the sympathetic trunk...

.

Using light microscopy, it appears as a bar at the apical surface of the cell, wherein the structures listed cannot be resolved. With electron microscopy, the terminal bar can be visually disseminated into these structures.

The terminal bar is located on the lateral surface of epithelial cells, where the lateral surface meets the apical surface. It should not be confused with the Terminal web

Terminal web

The terminal web is a filamentous structure found at the apical surface of epithelial cells that possess microvilli. It is composed primarily of filaments of actin filaments stabilized by spectrin, which also anchors the terminal web to the apical cell membrane. The presence of myosin II and...

, which is an actinous web underlying microvilli on specialized epithelial cells.