Flexor Carpi Ulnaris Anatomy: Origin, Insertion, Action

Flexor Carpi Ulnaris Anatomy Study

Flexor Carpi Ulnaris Anatomy
Humeral head: medial epicondyle via the common flexor tendon
Ulnar head: medial aspect of the olecranon and the proximal three-fifths of the dorsal ulnar shaft
Insertion: Pisiform, hamate bones and 5th metacarpal
Action: Flexion and adduction of the wrist, aids with flexion of the forearm
Blood Supply: Muscular branches from the ulnar artery
Innervation: Ulnar nerve (C8, T1)

Synergist: Flexor carpi ulnaris, Palmaris longus
Antagonists: Abductor pollicis longus, Flexor pollicis longus, Flexor digitorum superficialis, Flexor digitorum profundus

For pain and symptom information see: Flexor Carpi Ulnaris Pain and Symptoms


Primary Actions of the Flexor Carpi Ulnaris:

1. Flexion of the wrist

  • Agonists: Palmaris Longus, Flexor Carpi Radialis
  • Antagonists: Extensor Carpi Radialis Longus, Extensor Carpi Radialis Brevis, Extensor Carpi Ulnaris

Secondary Actions of the Flexor Carpi Ulnaris:

2. Assists with ulnar deviation of the wrist

  • Agonists: Extensor Carpi Ulnaris
  • Antagonists: Extensor Carpi Radialis Longus, Extensor Carpi Radialis Brevis, Flexor Carpi Radialis

3. Helps stabilize wrist to permit strong thumb motion

Recommended Anatomy Study Aids

Trail Guide To The Body


The Trail Guide To The Body is another excellent book to help you learn the musculature of the human body. Though the book is geared toward massage therapists and physical therapist assistants, the book with its illustrations and text helps anyone gain a thorough understanding of the human musculoskeletal system and movement. I highly recommend this book for anyone studying anatomy and believe that MTs, PTAs, and teachers of body movements should have this book in their possession. I also highly recommend this book for the lay person who wants to gain understanding of the muscle, skeletal system and how our bodies move. This book will not disappoint!





Out of the scores of books in my office Basic Clinical Massage Therapy is by far the most referenced book in my library. The musculoskeletal system is overlaid on human models allowing you to learn the precise location, origin and insertions of each muscle. The models are pictured in various poses throughout the book which also helps you visualize muscles in motion and their actions relationship with the skeletal structure and other muscles. Though it is written for massage therapists, it is an excellent book for anyone who wants to learn about the muscular system. MT’s will benefit from recommended treatments for each muscle.





The Trigger Point Therapy Workbook – Claire Davies, Amber Davies, and David G. Simons

Basic Clinical Massage Therapy: Integrating Anatomy and Treatment – James H. Clay and David M. Pounds

Trigger Point Therapy for Myofascial Pain – Donna Finando and Steven Finando


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