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Flexor Digitorum Superficialis, Humero-ulnar Head

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Flexor Digitorum Superficialis (FDS), Humero-ulnar Head:

Proximal Attachment - Medial epicondyle and coronoid process

Distal Attachment - Shafts of middle phalanges of medial four digits

Innervation - Median nerve

Action - Flexes middle phalanges at proximal interphalangeal joints of middle four digits; acting more strongly, it also flexes proximal phalanges at metacarpophalangeal joints

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