AnatomyDeck

Muscle

Flexor digitorum superficialis

Flexes the PIP joints

Upper limbMuscular system

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

Your notes