Flexor digitorum superficialis
Proximal Attachment:
Humero-ulnar head - Medial epicondyle (common flexor origin and coronoid process)
Radial head - Superior half of anterior border
Distal Attachment:
Humero-ulnar head - Shafts of middle phalanges of medial four digits
Radial head - Shafts of middle phalanges of medial four digits
Innervation:
Humero-ulnar head - Median nerve (C7, C8, T1)
Radial head - Median nerve (C7, C8, T1)
Main Action(s):
Humero-ulnar head - Flexes middle phalanges at proximal interphalangeal joints of middle four digits; acting more strongly, it also flexes proximal phalanges at metacarpophalangeal joints
Radial head - Flexes middle phalanges at proximal interphalangeal joints of middle four digits; acting more strongly, it also flexes proximal phalanges at metacarpophalangeal joints