Flexor Digitorum Profundus (FDP)

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: Muscles that move the Forearm²

Mucous sheaths of the tendons of the wrist and digits¹

Transverse section of distal forearm¹

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 digitorum profundus	Proximal 2/3 of Ulna Interosseous_membrane	Palmar surface of Distal phalanges 2-5	Median n. (digits 2-3) Ulnar n. (digits 4-5) C8 - T1	Wrist: Flexion MCP, PIP, & DIP 2-5: Flexion

Origin

• Ulna (proximal 2/3 of anteromedial surface)⁶
• IO membrane⁶

Insertion

Palmar surface of distal phalanges 2-5⁶

Innervation

• Digits 2-3: Anterior Interosseous N. (C8, T1)⁶
• Digits 4-5: Ulnar N. (C8, T1)⁶

Action

• Wrist: Flexion⁶
• MCP, PIP, DIP 2-5: Flexion⁶

Examination

FDP Test

References

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.