Flexor digitorum profundus muscle

Flexor digitorum profundis, along with flexor digitorum superficialis have long tendons that run down the arm and through the carpal tunnel[?] that attach to the palmar side of the phalanges of the fingers. This muscle originates from the anterior side of the ulna.

Flexor digitorum profundis lies deep to superficialis, but it attaches more distally. To get around this problem profundus's tendons go through the tendons of superficialis, and end up attaching to the distal phlanx.

It is one of the two flexor muscles of the forearm that are not supplied by the median nerve. (The other is flexor carpi ulnaris[?].) The medial two digits of profundus are supplied by the ulnar nerve.