Bone
Attaching Structures as Insertion
- Abductor Pollicis Longus - Radial Side
- Anterior Oblique Ligament of 1st Carpometacarpal Ligament - Medial Side
- Posterior Oblique Ligament of 1st Carpometacarpal Ligament - Medial Side
- Radial Carpometacarpal Ligament