Flexor Carpi Ulnaris (FCU)

Authors

Affiliations

Nate Yomogida, B.S., SPT

Doctor of Physical Therapy

B.S. in Kinesiology

Chloë Kerstein, B.S., SPT

Doctor of Physical Therapy

B.A. in Neuroscience

Figure 1: Left Humerus (Anterior view)¹

Figure 2: Left Humerus (Posterior view)¹

Figure 3: Muscles that move the Forearm²

Mucous sheaths of the tendons of the wrist and digits¹

Transverse section of distal forearm¹

Palmar aponeurosis¹

Muscles of the thumb¹

Palmar muscles of the hand (left)¹

Reading list

• Wrist and finger flexor Muscles³
• ⁴
• MMT⁵

Muscle	Origin	Insertion	Innervation	Action
Flexor carpi ulnaris	Medial epicondyle Olecranon	Hook of Hamate Base of 5th metacarpal	Ulnar n. C7 - T1	Wrist: Flexion, Ulnar deviation

Origin

• Humeral head: Medial epicondyle of Humerus⁶
• Ulnar head: Olecranon of Ulna⁶

Insertion

• Pisiform⁶
• Hook of hamate⁶
• Base of 5th metacarpal⁶

Innervation

Ulnar N. (C7, C8, T1)⁶

Action

Wrist: Flexion, Ulnar deviation⁶

Notes

1.

Gray H. Anatomy of the Human Body. 20th ed. (Lewis WH, ed.). Lea & Febiger; 1918. https://www.bartleby.com/107/

2.

Betts JG, Blaker W. Anatomy and Physiology. 2nd ed. OpenStax; 2022. https://openstax.org/details/books/anatomy-and-physiology-2e/?Book%20details

3.

Donnelly JM, Simons DG, eds. Travell, Simons & Simons’ Myofascial Pain and Dysfunction: The Trigger Point Manual. Third edition. Wolters Kluwer Health; 2019.

4.

Neumann DA, Kelly ER, Kiefer CL, Martens K, Grosz CM. Kinesiology of the Musculoskeletal System: Foundations for Rehabilitation. 3rd ed. Elsevier; 2017.

5.

Weinstock D. NeuroKinetic Therapy: An Innovative Approach to Manual Muscle Testing. North Atlantic Books; 2010.

6.

Gilroy AM, MacPherson BR, Wikenheiser JC, Voll MM, Wesker K, Schünke M, eds. Atlas of Anatomy. 4th ed. Thieme; 2020.