The term "musculus extensor carpi radialis brevis or brevior" refers to a muscle in the forearm. The spelling of the word is complex, but can be broken down using IPA phonetic transcription. "Musculus" is pronounced /ˈmʌskjələs/, "extensor" is pronounced /ɪkˈstɛnsər/, "carpi" is pronounced /ˈkɑːrpaɪ/, "radialis" is pronounced /reɪˈdeɪliəs/, "brevis" is pronounced /ˈbriːvɪs/, and "brevior" is pronounced /ˈbriːvɪɔːr/. This muscle is responsible for extending the wrist and assisting in movements such as holding a pen or playing a musical instrument.
The musculus extensor carpi radialis brevis or brevior, commonly referred to as the extensor carpi radialis brevis or brevior, is a skeletal muscle located in the forearm. It belongs to a group of muscles known as the extensor carpi radialis muscles and is specifically classified as a short muscle.
The extensor carpi radialis brevis or brevior originates from the lateral epicondyle of the humerus, which is a bony prominence on the outer side of the upper arm bone. From the origin, it extends down the forearm and inserts onto the base of the third metacarpal bone, which is the bone that forms the knuckles of the middle finger.
As its name suggests, the primary function of the extensor carpi radialis brevis or brevior is to extend and radially deviate the wrist joint. This means that it plays a crucial role in movements involving the extension of the hand at the wrist joint, as well as moving the hand towards the thumb side of the arm.
Additionally, the extensor carpi radialis brevis or brevior also assists in stabilizing the wrist during gripping activities, particularly when a strong grip is required.
In summary, the musculus extensor carpi radialis brevis or brevior is a short muscle located in the forearm. Its main function is to extend and radially deviate the wrist joint, allowing for movements such as extending the hand and moving it towards the thumb side of the arm.
Radialis externus brevis; origin, external epicondyle of humerus; insertion, base of third metacarpal bone; nerve supply, radial (musculospiral); action, extends and abducts wrist.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.