Flexor Carpi Radialis Muscle: Action, Origin & Insertion

Instructor: Joshua Bowles

Joshua is a Sports Medicine and Athletic Training Instructor and has a Master's degree in Kinesiology.

In this lesson, we will discuss the Flexor Carpi Radialis Muscle. We will look at what this muscle helps us to perform, and the origin and insertion of the muscle.

A Golfer's Friend

Each muscle in the human body has it's own unique function and designated purpose. Some muscles are large and are quite obvious in their action and location, while others are often unnoticed, yet vitally important in our normal everyday functions, especially if you have ever swung a golf club. Some muscles play a more important role than other in different sports. For golf, a sport that requires unique technical movements with the wrists and hands, certain muscles can help make the difference between a great day on the course, or bad day. In this lesson we will discuss one of these small but important muscles, the Flexor Carpi Radialis.

Flexor Carpi Radialis

As with all muscles, the names are derived from Latin roots. For this particular muscle there are three parts to the name. The first word ''Flexor'' means to flex, or to shorten the angle of the joint. The second word, ''Carpi'', is derived from Latin meaning the wrist. And the third word, ''Radialis'', refers to the radius, one of two bones in the lower arm. So in simplified terms, this muscle is situated along the radius in the lower arm and abducts and flexes the wrist. Abduction , also known as radial deviation, of the wrist is the movement of the hand away from the body, or another way to think of it is the thumb moving closer to the forearm. The function that the Flexor Carpi Radialis allows is why it can be so vital for golfers or anyone needing fine motor skills with the wrist.

Highlighted Flexor Carpi Radialis muscle
Flexor Carpi Radialis muscle


The Flexor Carpi Radialis is located on the anterior side of the forearm, meaning the front of forearm which is the side closest to the body when your arms are down by your side at rest. This muscle originates on the medial epicondyle of the humerus, which means on the inside of the large projection at the end of the upper arm bone located at the elbow joint. This is also the typical site of an injury with regards to the Flexor Carpi Radialis muscle, as the majority of the tension from the muscle is located on this spot.

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