Metacarpals are the tubular bones located in the hand between the wrist bones (carpals) and the finger bones (phalanges) in land vertebrates. They essentially form the bony structure of the palm.
Understanding Metacarpals
- Location: Metacarpals reside in the mid-region of the hand, connecting the carpals of the wrist to the phalanges of the fingers.
- Structure: They are long bones, each consisting of a base (connecting to the carpals), a shaft (the main body), and a head (connecting to the phalanges).
- Function: Metacarpals provide structural support to the hand, allowing for flexibility and dexterity in grasping and manipulating objects. They also serve as attachment points for muscles and ligaments.
- Numbering: There are typically five metacarpals in each hand, numbered I to V, starting with the thumb (pollex) side and moving towards the little finger. Thus, the metacarpal of the thumb is metacarpal I, and the metacarpal of the little finger is metacarpal V.
- Homology: Metacarpals in the hand are analogous to metatarsals in the foot.
Clinical Significance
Metacarpal fractures are common injuries, often resulting from falls, direct blows, or crushing injuries. These fractures can affect hand function and may require immobilization or surgery to heal properly.
