Carpal Bone

The carpal bones are located near wrist bones that connect the distal regions of the outspread and ulnar bones of the lower arm to the foundations of the hand’s five metacarpal bones. There are eight carpal bones, which partition into two lines: a proximal column and a distal line. The carpal bones names or hand bones name are:

• Trapezium

• Trapezoid

• Scaphoid

• Hamate

• Pisiform

• Triquetrum

• Lunate

• Capilate 

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These bones make up the vast majority of the skeletal framework of the wrist and permit diverse neurovascular constructions and ligaments that enter the wrist to arrive at specific muscle gatherings and hard designs individually and give the innervation and blood supply essential for them to function.

Functions of Carpal Bone

All the carpal bones are essential to forming an efficient wrist joint or carpus joint. The wrist of our hand is the main part that is responsible for our hand movement. With the help of carpal bones only, the wrist moves, and we are able to do our daily-life work such as, eating, writing, holding things in our hands, and many more. If any of the carpal bones are damaged, then the wrist movement will definitely be affected. It also helps in holding our palm and hand bones together, as it is the joint in between them. 

Carpal Bones Anatomy

Every carpal bone has its own uniqueness for functioning features that help in the contribution to a specific functioning of the wrist. The scaphoid, named for its boat-like appearance, moulds the outspread line of the proximal carpal line, starting from the proximal column. The articular ligament covers a considerable percentage of the scaphoid’s outer layer, allowing it to link the junction between the two carpal columns.   The lunate is located between the scaphoid and the triquetrum, adjacent to the middle nerve, and is depicted for its bow shape. The triquetrum is a pyramid-moulded bone that verbalises with the pisiform, lunate, and hamate bones. Last, the pisiform is a pea-moulded bone that verbalises with the triquetrum on its dorsal surface and fills in as a connection site for different ligaments and tendons. 

Trapezium and Trapezoid

In the distal column, the trapezium is present in between the scaphoid and the metacarpal bones. It has a seat moulded aspect for verbalisation with the principal metacarpal and gives a site to a couple of ligaments and tendons to one or the other pass-through or connect. The trapezoid is the littlest carpal bone and is situated between the trapezium and the capitate. On the other hand, the capitate is the biggest and most focal carpal bone, with verbalisations to a few bones and connections to a few intercarpal tendons. Last, the hamate, named for its snare like hamulus, structures the ulnar boundary of the distal carpal line that serves to secure the ulnar supply route and nerve inside Guyon’s trench and give connections to a few tendons also. 

Three Curves

By and large, the bones of the hand track down their plan in three curves: one longitudinal curve, crossing the hand longwise, and two cross over curves, one at the level of the metacarpal head and the second cross over curve at the level of the carpus. This life system precisely adds to the hand’s capacity to get a handle on objects. Specifically, the game plan of the carpal bones in a cross over curve makes up the floor of the carpal passage and offers help and insurance to the finger flexor ligaments and the middle nerve. Additionally, the scaphoid and trapezium both have unmistakable tubercles projecting anteriorly that not just contribute altogether to the hard life systems of the carpal passage yet additionally give a supporting base to the thumb to permit it to go against the remainder of the hand and, in this manner, further improve the hand’s capacity to get a handle on objects.