The Zonula occuldens, zonula adherens and Macula adherens are collectively referred to as the terminal bar or junctional complex.

Question

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The statement to evaluate is: The Zonula occuldens, zonula adherens and Macula adherens are collectively referred to as the terminal bar or junctional complex.

Option 1 (True): This option aligns with classic histology terminology. The tight junction (zonula occuldens), the belt desmosome (zonula adherens), and the macula adherens (desmosomes) are the components that together form the epithelial junctional complex, historically termed the terminal bar in EM studies. Seeing all three structures together as a functional unit that seals cell borders and links intermediate filaments to cell membranes supports the validity of calling them the terminal bar or junctional complex. Thus, this statement accurately reflects the traditional description of the junctional apparatus in epithelial cells.

Option 2 (False): This option would be correct only if the three components were not collectively referred to as a single structure, or if the term terminal bar/junctional complex had a different, more restricted meaning. However, standard anatomical texts describe the zipper-like tight junction along with adherens junctions and desmosomes as components of the junctional complex, sometimes specifically called the terminal bar in early electron micrographs. Therefore labeling this option as false would introduce a factual inaccuracy about established terminology.

In summary, the true statement correctly describes the trio of tight junctions, adherens junctions, and desmosomes as forming the junctional complex, often referred to as the terminal bar.

AVBS2005 (ND) Cytology

The Zonula occuldens, zonula adherens and Macula adherens are collectively referred to as the terminal bar or junctional complex.

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