Parenchyma

Part of speech: noun

Pronunciation: /pəˈɹɛŋ.kɪm.ə/

Definitions

1. This term describes the fundamental tissue in organs responsible for specific biological functions and activities in organisms
2. It refers to the essential cellular structure in various organs that plays a crucial role in maintaining their functions
3. This expression denotes the primary functional tissue within organs that contributes to their specific roles in biological systems

Etymology: Erasistratus, the Greek anatomist working in Alexandria in the third century BC, gave the name "parenchyma" to a substance he saw inside the lungs, liver, kidneys and spleen. He thought it had been poured in beside the blood vessels that run into those organs, as if the veins had formed it separately. The Greek word, "parenkhuma," meant "anything poured in beside," built from "para," meaning "beside," and "enkhuma," meaning "instillation" or "the contents of a vessel." The anatomical idea was wrong, but the name stuck. Modern usage applies it to the functional tissue of an organ, the cells that do the organ's real work, as distinct from the supporting framework or the vessels that serve it. Its English form draws on the same Greek elements, with the "-enchyma" ending now standing for the living cellular material of a plant or animal organ.