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Questions and Answers
What are intercellular junctions primarily formed between?
What are intercellular junctions primarily formed between?
- Cells and blood vessels
- Non-cellular surfaces only
- Cells and non-cellular surfaces (correct)
- Nerve cells and muscle cells
Where are desmosomes primarily located?
Where are desmosomes primarily located?
- In the blood vessels
- In connective tissue
- In superficial layers of skin or oral mucosa (correct)
- In bone tissue
What type of cellular junction connects a cell to an adjacent non-cellular surface?
What type of cellular junction connects a cell to an adjacent non-cellular surface?
- Hemidesmosome (correct)
- Tight junction
- Gap junction
- Desmosome
Which statement distinguishes hemidesmosomes from desmosomes?
Which statement distinguishes hemidesmosomes from desmosomes?
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What role do hemidesmosomes play in oral mucosa?
What role do hemidesmosomes play in oral mucosa?
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Study Notes
Intercellular Junctions
- Intercellular junctions are formed between cells and also between cells and non-cellular surfaces.
- These junctions provide mechanical attachment and allow for the passage of signals between cells.
Desmosomes
- Desmosomes are intercellular junctions found primarily in the superficial layers of the skin and oral mucosa.
- They act as strong attachments between cells, preventing them from detaching during mechanical stress.
- Desmosomes are also involved in tissue turnover and cell migration during tissue repair.
Hemidesmosomes
- Hemidesmosomes are intercellular junctions that connect cells to non-cellular surfaces, like the basement membrane.
- They play a crucial role in attaching epithelium to connective tissue in the skin and oral mucosa.
- Hemidesmosomes have a smaller attachment plaque and only tonofilaments on the cellular side compared to desmosomes.
- Hemidesmosomes are functionally half a desmosome.
- Hemidesmosomes contribute to the attachment of gingival tissue to tooth surfaces.
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