Pronunciation: [ɛkstˈɛnsə] (IPA) 
The word "extensor" is spelled with the letters E-X-T-E-N-S-O-R. In IPA phonetic transcription, it is pronounced as /ɪkˈstɛnsər/. The first syllable "ek-" is pronounced with a short "i" sound, followed by the stressed syllable "-ten" with a short "e" sound. The final syllable "-sor" is pronounced with a short "o" sound. This word refers to a muscle that stretches a body part, such as an arm or a leg, away from the body.
An extensor refers to a type of anatomical structure or muscle that facilitates extension of a body part or joint. It can be either a muscle or a ligament that helps extend or straighten out a limb, digit, or joint, thus opposing the movement facilitated by a flexor. The term extensor comes from the word "extend," which implies the process of lengthening or straightening.
In human anatomy, extensors are quite vital in enabling movement and stability. They are commonly found in the musculoskeletal system, where they permit controlled extension of joints, promoting various functions like walking, running, and gripping. Additionally, the extensor mechanism plays a crucial role in maintaining proper posture and balance.
The extensor muscles are usually located on the posterior side of the body, acting in opposition to flexor muscles. Some prominent extensors include the extensor muscle groups of the forearm, hand, fingers, wrist, ankle, toes, and knee. These muscles contract to exert force, enabling extension and counteracting the flexion movements initiated by flexor muscles.
In summary, an extensor is a muscle or ligament responsible for extending or straightening a body part or joint. It aids in movements such as walking, running, and gripping, while also supporting overall posture and balance. The extensor mechanism consists of various muscles located on the backside of the body, working against the actions of flexor muscles.
A muscle the contraction of which tends to straighten a limb; the antagonist of a flexor; see under musculus.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
In anat., a muscle of the body which serves to extend or straighten.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
The word "extensor" originated from the Latin word "extensor", which is derived from the verb "extendere". "Extendere" combines the prefix "ex-" (out) with "tendere" (to stretch), meaning "to stretch out". This Latin root gives the idea of the function of extensor muscles, which are responsible for stretching or extending a joint or body part, allowing movement away from the body. Thus, the etymology of "extensor" reflects its meaning related to stretching or extending.
