Spry Juncture, LLC
How to Evolve Gracefully
Flexor Digitorum Superficialis
Region
Origin & Insertion
['Origin: Medial epicondyle of humerus, coronoid of ulna, anterior radius', 'Insertion: Middle phalanges of fingers 2–5']
Synergistic Muscles
['FDP', 'Lumbricals']
Joints
['Elbow', 'Wrist', 'MCP', 'PIP joints of fingers 2–5']
Primary Actions
['Flexes PIP joints and assists in MCP and wrist flexion']
Nerve & Spinal Segment
Median nerve
Brachial plexus; C7–T1
Interesting
Separates into four tendons at carpal tunnel. [Moore’s]
Reversal of Action
Pull palm toward digits (closed chain press)
Common Dysfunctions
Impaired finger flexion and dexterity
How to Stretch
Finger extension with straight wrist.
Trigger Points
How to Strengthen
Isolated PIP resistance (rubber band).
Concentric Action
Flex PIP joints
Applications:
Important in early grip reactivation and carpal tunnel therapy
Eccentric Action
Release grip from mid-flexion
Isotonic Action
Finger curls with resistance putty or band
Related Conditions
['Carpal tunnel', 'Flexor strain']
Isometric Action
Sustain partial finger flexion with resistance
Exercise Ideas
['Tendon glides', 'Finger curls', 'Putty press']