Flexor Digitorum Superficialis
Origin: Ulnar head: medial epicondyle of the humerus via the common flexor tendon, medial border of the base of the coronoid process of the ulna, and ulnar collateral ligament
Radial head: oblique line of the radius along its supero-anterior border
Radial head: oblique line of the radius along its supero-anterior border
Insertion: Volar surface of the base of each middle phalanx of the four digits
Actions: Flexion of the digits, Flexion of the wrist
Innervation: Median nerve (C7, C8, T1)
Blood Supply: Muscular branches from the ulnar and radial arteries
Primary Actions of the Flexor Digitorum Superficialis:
1. Flexion of the digits at the proximal interphalangeal joints
- Agonists: Flexor Digitorum Profundus
- Antagonists: Lumbricals, Dorsal Interossei, Palmar Interossei, Extensor Digitorum, Extensor Indicis, Extensor Digiti Minimi
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Secondary Actions of the Flexor Digitorum Superficialis:
2. Assists with flexion of the digits at the metacarpophalangeal joints
- Agonists: Dorsal Interossei, Palmar Interossei, Lumbricals, Flexor Digitorum Profundus, Flexor Digiti Minimi
- Antagonists: Extensor Digitorum, Extensor Indicis, Extensor Digiti Minimi
3. Assists with flexion of the wrist
- Agonists: Flexor Carpi Radialis, Palmaris Longus, Flexor Carpi Ulnaris
- Antagonists: Extensor Carpi Radialis Longus, Extensor Carpi Radialis Brevis, Extensor Carpi Ulnaris
For pain and symptom information see: Flexor Digitorum Superficialis Pain and Symptoms
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For intermediary anatomy students learning skeletal and muscle structure.
For beginning and intermediary anatomy . Muscle overlays on the human body. Excellent visuals!
