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Name the type of joint between carpal/ metacarpal of a thumb.

Last updated date: 25th Jul 2024
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Hint: The first metacarpal bone, also known as the thumb's metacarpal bone, is the first bone proximal to the thumb. At the first carpometacarpal joint, it connects to the trapezium of the carpus, and at the first metacarpophalangeal joint, it connects to the proximal thumb phalanx.

Complete answer:
The saddle-shaped synovial joint connects the carpal and metacarpal of the thumb. A synovial joint is one in which one of the joint's bones is shaped like a saddle and the other bone rests on it like a rider on a horse.
Saddle joints give the bones more stability while still giving them more flexibility than a hinge or gliding joint. Biaxial joints are the functional classification for saddle joints. The first carpometacarpal joint, located at the base of the thumb, is made up of the trapezium (a carpal bone) and the first metacarpal bone. The thumb will travel away from the palm of the hand in two planes thanks to this joint.

The flexion, extension, adduction, abduction, and circumduction movements of saddle joints are similar to those of the condyloid joint. Axial rotation, on the other hand, is not permitted. Saddle joints are biaxial, meaning they can pass in both the sagittal and frontal planes. A saddle joint with reciprocal receipt articulation is a synovial joint with opposing surfaces that are reciprocally concave and convex. The thumb, thorax, middle ear, and heel are all places where it can be found.