Multangular bone

Multangular bone

The multangular bone refers to two distinct bones in the human wrist: the trapezium bone and the trapezoid bone. These bones are part of the carpal bones in the wrist and play a crucial role in the complex movements of the hand.

Trapezium Bone

The trapezium bone is one of the eight carpal bones situated in the wrist. It is located on the radial side of the wrist, adjacent to the scaphoid bone and the first metacarpal bone. The trapezium bone is characterized by its saddle-shaped articular surface, which articulates with the base of the thumb, allowing for a wide range of thumb movements, including opposition, which is essential for grip and dexterity.

Trapezoid Bone

The trapezoid bone is another carpal bone located in the distal row of the carpus. It is positioned between the trapezium bone and the capitate bone, and it articulates with the second metacarpal bone. The trapezoid bone is the smallest bone in the distal row of the carpus and has a wedge-like shape. It plays a significant role in stabilizing the base of the index finger and contributes to the overall stability and function of the wrist joint.

Function

The multangular bones, comprising the trapezium and trapezoid bones, are integral to the biomechanics of the wrist and hand. They facilitate a range of movements, including flexion, extension, abduction, and adduction of the thumb and fingers. These movements are essential for performing everyday tasks that require fine motor skills, such as writing, typing, and manipulating small objects.

Clinical Significance

Injuries or conditions affecting the multangular bones can significantly impair hand function. Common issues include fractures, arthritis, and carpal tunnel syndrome. Proper diagnosis and treatment are crucial for restoring normal hand function and preventing long-term disability.

Related Pages

• Carpal bones
• Trapezium bone
• Trapezoid bone
• Scaphoid bone
• Metacarpal bones
• Wrist joint
• Thumb
• Hand