Oblique cord is the modification of
Flexor pollicis Longus
Flexor Pollicis Brevis
Supinator
Pronator Teres
After bih, the proximal pas of the flexor digitorum profundus and flexor pollicis Longus FPL muscles were likely replaced by collagenous tissues, providing a specific type of intermuscular septum i.e., the oblique cord. Reference: Vishram Singh Anatomy; 2nd edition; Page no: 134
Upper limb