Bone
Attaching Structures as Insertion
- Collateral Ligaments of the 1st IP - Palmar Aspect. Blends with the Lateral Margins of the Palmar Ligament
- Extensor Pollicis Longus - Dorsal Surface
- Flexor Pollicis Longus - Palmar Surface
- Palmar Ligament of the 1st IP - Anterior Margin