Endomembranes

Part of speech: noun

Definitions

1. A system of membranes within a cell that serves to compartmentalize various cellular functions and processes; these structures include the nuclear envelope, endoplasmic reticulum, and Golgi apparatus; they facilitate communication and transport between organelles
2. Membranes found inside a cell that create distinct environments for different biochemical activities, including protein synthesis and modification; this includes organelles like lysosomes and vesicles; they ensure cellular organization and efficiency
3. An interconnected network of membranes within eukaryotic cells that segregates metabolic pathways and organelle functions; such membranes play crucial roles in cell signaling and material transport; they encompass structures like the plasma membrane and endosomes

Etymology: "Endomembrane" is a modern scientific coinage, built from two parts: "endo-", from Ancient Greek "éndon", meaning "within", and "membrane", from Latin "membrana", meaning a thin skin or covering. Put together, the term names the membranes found inside a cell, rather than the outer cell membrane that encloses it. The word is a technical formation rather than an old one. Its parts are classical, but the combination was made by biologists to name a group of related structures, including the nuclear envelope, the endoplasmic reticulum, the Golgi apparatus, and vesicles that move material between them. Grouping these membranes under one label reflects the idea that they form a connected system within the cell. "Endomembranes" is simply the plural, referring to several or all of these internal membrane systems together.

Synonyms: internal membranes, intracellular membranes, organelle membranes