What does desmosome mean?
A desmosome is a specialized structure on the surface of a cell that acts like a microscopic rivet, fastening it firmly to a neighbouring cell so that tissues can withstand stretching and mechanical stress. Named for its role in cellular bonding, it consists of dense protein plaques on opposing cell membranes, linked by adhesion proteins across the gap and anchored internally to tough keratin filaments. Desmosomes are especially abundant in tissues subject to constant strain—skin, heart muscle, and the cervix—which is why defects in them cause serious disease: autoimmune antibodies against these junctions produce the blistering disorder pemphigus, and inherited mutations can lead to cardiomyopathy and arrhythmias. The word is technical, belonging to the vocabulary of cell biology, histology, and dermatology, but understanding it illuminates why some organs hold together under force while fragile ones fall apart when their molecular glue fails.
nounA specialized cell structure that functions as a spot weld or rivet, firmly binding the intermediate filaments of one cell to those of an adjacent cell or to the extracellular matrix, providing strong adhesion between cells.
- A button-like intercellular junction that mechanically links intermediate filaments of adjacent epithelial and other cells, providing tissue strength.
"The blisters characteristic of pemphigus result from antibodies that attack desmosomes, causing skin cells to pull apart."
"Under the electron microscope, each desmosome appears as a dense plaque where two cell membranes are held tightly together."
"Autoimmune destruction of desmosomes in pemphigus vulgaris leads to painful blistering of the skin and mucous membranes."
Regular plural formed by adding -s; standard in all scientific writing.
"Desmosomes are most numerous in tissues exposed to mechanical stress."
Every time you flex a muscle or stretch your skin, millions of microscopic 'rivets' called desmosomes keep your cells from ripping apart.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of desmosome
Desmosome was coined in the early 20th century by Italian anatomist Giuseppe Pianese, combining the Greek 'desmos', meaning bond or chain, with 'soma', meaning body — literally 'bonding body'. The root 'desmos' also survives in medical terms such as syndesmosis, referring to a fibrous joint, while 'soma' underlies familiar words such as somatic, psychosomatic, and chromosome. The term entered English-language scientific literature through histology texts describing how epithelial cells are riveted together.
Related word forms
How desmosome is actually used
Desmosome is a technical term used almost exclusively in histology, cell biology, dermatology, and medicine. It is formal register, typically pluralized as desmosomes in scientific writing. The adjective form is desmosomal.
Easily confused with desmosome
A hemidesmosome anchors a cell to the underlying basement membrane rather than joining two neighboring cells together as a desmosome does.
Tight junctions seal the gap between adjacent cells to block leakage of molecules, whereas desmosomes provide mechanical strength without forming a seal.