The bones of the carpal are eight small bones that form the wrist and that joins the hand with the forearm. In human anatomy, the main role of the carpal bone is to facilitate effective hand positioning.
In the tetrapods, the carpal is the only cluster of bones in the wrist between the radius and the elbow. The bones of the carpal do not belong to individual fingers, while the bones of the wrist. The carpal bones allow the wrist to move and rotate vertically.
Carpal bones mnemonic functions
There are four groups of ligaments in the wrist area:
Proper wrist ligaments that connect the ulna and radius of the wrist: ulnar and radial collateral ligaments; hand-dorsal palmar dorsal ligaments; and elbow ligaments palmar.
Ligaments of the intervertebral joints that connect the bones of the wrist: radial ligament of the wrist; dorsal, palmar and interosseous ligaments; and the ligaments of pisohamate.
Ligaments of the wrist and metacarpal joints, which connect the wrist bones with the metacarpus bones: the ur between the patellar ligament and the palmar-dorsal ligaments.
Ligaments of the intervertebral joints that connect the metacarpal bones because of dorsal, and palmar metacarpal ligaments.
Eight wrist bones can be conceptually organized as two transverse rows or three longitudinal columns.
When considered as paired rows, each row forms an arc that is convex proximal and concave distal. On the palmar side, the wrist is concave and forms a wrist channel that is covered by the flexor retinaculum.
The proximal row (including scaphoid, lunacy, and triquetrum) connects to the radius and distal surfaces of the wrist, and therefore continuously adapts to these moving surfaces. In the proximal row, each wrist bone has little independent mobility.
For example, boat-likeness contributes to the stability of the metatarsus by articulating distally with the trapezoid and trapezium. In contrast, the distal order is stiffer when its transverse arch moves with the metacarpus.