Muscle
Flexor digitorum superficialis
Flexes the PIP joints
High-yield
Flexes PIP joints (and MCP); tendons split to let FDP pass through. Entirely median nerve.
Overview
The intermediate-layer flexor that splits to insert on the middle phalanges, flexing the proximal interphalangeal joints of the four fingers.
Reference facts
- Origin
- Humeroulnar head: medial epicondyle and coronoid process; radial head: anterior oblique line of the radius
- Insertion
- Sides of the middle phalanges of the medial four fingers
- Action
- Flexes the PIP joints of the four fingers; also flexes the MCP joints and wrist
- Innervation
- Median nerve (C7, C8, T1)
- Blood supply
- Ulnar and radial arteries
Frequently asked questions
What does the flexor digitorum superficialis do?
The flexor digitorum superficialis flexes the PIP joints of the four fingers; also flexes the MCP joints and wrist.
What nerve innervates the flexor digitorum superficialis?
The flexor digitorum superficialis is innervated by the median nerve (C7, C8, T1).
Where does the flexor digitorum superficialis attach?
Origin: Humeroulnar head: medial epicondyle and coronoid process; radial head: anterior oblique line of the radius. Insertion: Sides of the middle phalanges of the medial four fingers.
What is the blood supply of the flexor digitorum superficialis?
The flexor digitorum superficialis is supplied by the ulnar and radial arteries.