The spelling of the word "musculus extensor carpi radialis longus or longior" can be explained using the International Phonetic Alphabet (IPA). The sound of "musculus" is pronounced as /ˈmʌskjʊləs/, while "extensor" is pronounced as /ɪkˈstɛnsər/. "Carpi" is pronounced as /ˈkɑːpi/, and "radialis" as /rəˈdaɪəlɪs/. "Longus" is pronounced as /ˈlɒŋɡəs/, whereas "longior" is pronounced as /ˈlɒnɡiɔːr/. By using IPA phonetic transcription, the spelling of this word can be easily understood and pronounced correctly.
The musculus extensor carpi radialis longus or longior, commonly referred to as the extensor carpi radialis longus muscle, is one of the primary muscles located in the posterior compartment of the forearm. It is a long and slender muscle that originates from the lateral supracondylar ridge of the humerus, specifically from the lateral intermuscular septum. From this point of origin, the muscle then extends downwards towards the forearm.
This muscle attaches to the base of the second metacarpal bone of the hand through a long and thin tendon. As the name suggests, the primary function of the musculus extensor carpi radialis longus is to extend and abduct the wrist joint. This means that when contracting, it is responsible for moving the hand backward (extension) and away from the center of the body (abduction).
The extensor carpi radialis longus muscle is innervated by a branch of the radial nerve, known as the posterior interosseous nerve. It works in conjunction with other muscles of the forearm, particularly with the extensor carpi radialis brevis muscle, to allow for a wide range of movements involved in wrist extension and abduction.
In summary, the musculus extensor carpi radialis longus is a slender muscle located in the posterior compartment of the forearm. It is responsible for the extension and abduction of the wrist joint and is innervated by the posterior interosseous nerve.
M. radialis externus longus; origin, external supracondyloid ridge of humerus; insertion, back of base of second metacarpal bone; nerve supply, radial (musculospiral); action, extends and abducts wrist.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.