Question

Joint between carpal and metacarpal of human thumb is an example of-
A. Hinge joint
B. Saddle joint
C. Gliding joint
D. Pivot joint

Answer 1

The first metacarpal bone, otherwise called the thumb's metacarpal bone, is the primary bone proximal to the thumb. At the first carpometacarpal joint, it interfaces with the trapezium of the carpus, and at the first metacarpophalangeal joint, it associates with the proximal thumb phalanx.

Complete answer:
The seat formed in synovial joint interfaces the carpal and metacarpal of the thumb. A synovial joint is one in which one of the joint's bones is molded like a seat and the other bone lays on it like a rider on a pony. Saddle joints give the bones greater strength while giving them more adaptability than a pivot or gliding joint. Biaxial joints are the useful characterization for saddle joints. The first carpometacarpal joint, situated at the foundation of the thumb, comprises the trapezium (a carpal bone) and the main metacarpal bone. The thumb will travel away from the palm of the hand in two planes on account of this joint. Saddle joint is a kind of synovial joint. Synovial joint permits free development of bones. Numerous kinds of synovial joints are found, for example, ball and socket joint, synovial joint, pivot joint and condylar joint. A synovial joint at the closures of bone synovial layers secretes fluid that is called synovial liquid. This gives grease to bones. Saddle joint is a little type of ball and socket joint. There are six kinds of synovial joints. These are a turn, pivot, saddle, plane, condyloid, and ball and socket joints. The pivot joint is a sort of synovial joint that permits revolution which permits the movement of the head to and fro. The pivot joint is a sort of synovial joint which permits development just in one axis, that is flexion and extension. Knee joint, lower leg joint are instances of the pivot joint. Ball and socket joint permits movement in various ways. In this kind of joint, the ball-formed surface of one joint lies in the attachment like the gloom of another joint. The hip joint is an illustration of a ball and socket joint. Saddle joint is the joint present between the carpal and metacarpal of the thumb. It permits flexion, expansion, adduction,etc. It gives security and adaptability to bones.

Hence, the correct answer is option B.

Note:
The flexion, adduction and circumduction movements of saddle joints are like those of the condyloid joint. Axis revolution, then again, isn't allowed. Saddle joints are biaxial, which means they can pass in both the sagittal and front facing planes. A saddle joint with equal receipt explanation is a synovial joint with restricting surfaces that are proportionally inward and curved. The thumb, chest, center ear, and heel are on the whole where it tends to be found.