Anatomical Features of Individual Bones in the Upper Limb
Metacarpal Bones – Structure and Articulations
Metacarpal bones form the skeletal framework of the hand, connecting the wrist to the fingers. Understanding their structure and articulations is essential for diagnosing fractures and joint disorders.
Anatomical Features of Individual Bones in the Upper Limb
Metacarpal Bones – Structure and Articulations
The metacarpal bones form the skeletal framework of the palm. Each hand has five metacarpal bones numbered from I (thumb) to V (little finger).
Structure
- Each metacarpal bone consists of a base, shaft, and head.
- The base articulates proximally with the carpal bones.
- The shaft is elongated and slightly curved.
- The head articulates with the proximal phalanges.
Articulations
Metacarpal bones articulate proximally with the carpal bones and distally with the proximal phalanges. The first metacarpal differs significantly in its articulation due to the saddle joint formed with the trapezium, allowing greater mobility.
Clinical Significance
- Fractures, particularly Boxer's fractures, are common in the metacarpals.
- Dislocations may occur due to trauma.
- Degenerative conditions like osteoarthritis can affect the metacarpal joints.
Conclusion
The metacarpal bones are crucial for hand movement and stability. Understanding their anatomy aids in diagnosing and treating hand-related conditions.
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