| Origin |
Proximal 3/4 of medial and anterior surfaces of ulna and interosseous membrane |
| Insertion |
Bodies of middle phalanges of medial four
digits |
| Action |
Flexes distal phalanges at distal interphalangeal joints of medial four digits; assists with flexion of hand |
| Innervation |
Medial part: ulnar nerve (C8 and T1)
Lateral part: (C8 and T1) |
Arterial
Supply |
Ulnar and anterior interosseous arteries |