1st Metacarpal

Parent Structures

• Metacarpals

Bone Classification

• Long

Bony Features

• Base of 1st Metacarpal
• Head of 1st Metacarpal
• Shaft of 1st Metacarpal

Attaching Structures as Origin

• 1st Dorsal Interossei of the Hand - Medial Side
• Palmar Ligament of the 1st MCP - Anterior Aspect of the Neck

Attaching Structures as Insertion

• Opponens Pollicis - Lateral Half of the Anterior Surface

Associated Joints

• 1st Carpometacarpal Joint
• 1st Metacarpophalangeal Joint (1st MCP)

Structures Attaching to Bony Features as Origin

• Head of 1st Metacarpal
  • Collateral Ligaments of the 1st MCP - Tubercle and Adjacent Depression on the side of the Metacarpal Head
• Shaft of 1st Metacarpal
  • 1st Palmar Interossei of the Hand - Medial Side

Structures Attaching to Bony Features as Insertion

• Base of 1st Metacarpal
  • 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