Flexor Carpi Radialis Muscle Anatomy

Overview
Origin Medial epicondyle of the humerus
Insertion Bases of the second and third metacarpal bones
Action Flexion of the wrist joint
Abduction of the wrist joint
Nerve Median nerve (C6-C7)
Artery Radial artery
Posterior branch of the ulnar recurrent artery

Location

The flexor carpi radialis as a superficial muscle located in the forearm. It is a long and relatively thin muscle running just laterally of flexor digitorum superficialis. It connects the humerus to the metacarpals in the hands. Its visibility from the skin’s surface is more pronounced during wrist flexion. It is one of four muscles in the superficial layer of the anterior compartment of the forearm. The other three are: the palmaris longus, flexor carpi ulnaris, and the pronator teres [1]Moore KL, Agur AMR, Dalley AF. Clinically Oriented Anatomy. 8th ed. Philadelphia: Lippincot Williams & Wilkins; 2017..

Origin & Insertion

The flexor carpi radialis originates on the medial epicondyle of the humerus. It then travels down towards the lateral side of the forearm. Once it reaches the wrist its tendon then continues downwards to insert at the bases of the second and third metacarpal bones [2]Schmidt HM. Clinical anatomy of the m. flexor carpi radialis tendon sheath. Acta Morphol Neerl Scand. 1987;25(1):17-28. PMID: 2449801. [3]Moore KL, Agur AMR, Dalley AF. Clinically Oriented Anatomy. 8th ed. Philadelphia: Lippincot Williams & Wilkins; 2017. [4]Irie, T., Motomiya, M. & Iwasaki, N. Absence of flexor carpi radialis identified during volar approach for fixation of distal radius fracture: a case report. BMC Res Notes 11, 240 (2018). … Continue reading [5]Kanevsky J, Zammit D, Brutus JP. Rupture of the flexor carpi radialis tendon secondary to trauma: case report and literature review. Plast Aesthet Res 2015;2:138-9. … Continue reading.

Actions

The main function of the flexor carpi radialis is to perform flexion at the wrist joint. It also plays an assistive role in performing abduction of the hand and wrist [6]Moore KL, Agur AMR, Dalley AF. Clinically Oriented Anatomy. 8th ed. Philadelphia: Lippincot Williams & Wilkins; 2017. [7]Kanevsky J, Zammit D, Brutus JP. Rupture of the flexor carpi radialis tendon secondary to trauma: case report and literature review. Plast Aesthet Res 2015;2:138-9. … Continue reading.

Innervation

Innervation of the flexor carpi radialis is provided by the median nerve (C6-C7) [8]Moore KL, Agur AMR, Dalley AF. Clinically Oriented Anatomy. 8th ed. Philadelphia: Lippincot Williams & Wilkins; 2017..

Blood Supply

Blood is supplied to the flexor carpi radialis via the radial artery and the posterior branch of the ulnar recurrent artery [9]Standring S, Ellis H, Healy J, Johnson D, Williams A, Collins P, Wigley C. Gray’s anatomy: the anatomical basis of clinical practice. American journal of neuroradiology. 2005 Nov;26(10):2703) [10]Moore KL, Agur AMR, Dalley AF. Clinically Oriented Anatomy. 8th ed. Philadelphia: Lippincot Williams & Wilkins; 2017..

Images

flexor carpi radialis muscle

Here we can see the flexor carpi radialis muscle from an isolated view.

superficial view of the flexor carpi radialis

Here we can see a superficial view of the flexor carpi radialis amongst the other muscles of the arm.

origin of the flexor carpi radialis

Highlighted in red is the origin of the flexor carpi radialis on the medial epicondyle of the humerus.

insertion of the flexor carpi radialis

Highlighted in blue is the insertion of the flexor carpi radialis on the bases of the second and third metacarpal bones.

Want some flashcards to help you remember this information? Then click the link below:
Flexor Carpi Radialis Flashcards

References

References
1, 3, 6, 8, 10 Moore KL, Agur AMR, Dalley AF. Clinically Oriented Anatomy. 8th ed. Philadelphia: Lippincot Williams & Wilkins; 2017.
2 Schmidt HM. Clinical anatomy of the m. flexor carpi radialis tendon sheath. Acta Morphol Neerl Scand. 1987;25(1):17-28. PMID: 2449801.
4 Irie, T., Motomiya, M. & Iwasaki, N. Absence of flexor carpi radialis identified during volar approach for fixation of distal radius fracture: a case report. BMC Res Notes 11, 240 (2018). https://doi.org/10.1186/s13104-018-3348-z
5, 7 Kanevsky J, Zammit D, Brutus JP. Rupture of the flexor carpi radialis tendon secondary to trauma: case report and literature review. Plast Aesthet Res 2015;2:138-9. http://dx.doi.org/10.4103/2347-9264.157108
9 Standring S, Ellis H, Healy J, Johnson D, Williams A, Collins P, Wigley C. Gray’s anatomy: the anatomical basis of clinical practice. American journal of neuroradiology. 2005 Nov;26(10):2703)