Where is the first joint of thumb

summary

Many people may not know where the first joint of the thumb starts, because the thumb itself has two links, one is higher and the other is lower. Let's talk about where the first joint of the thumb is.

Where is the first joint of thumb

First, the joint is a kind of differential growth, which constitutes the characteristic structure necessary for different growth, extension force, shear force, compression force, torsion force transmission and various movements. The main function of the joint at any given time depends on the position of the joint and the age of the individual. The classification system of joints varies from simple system to more complex system.

Second: there are only two phalanges in the thumb, which are the joints between the two phalanges. The next joint is called the metacarpal joint. Anatomically, the top of the head is the top and the foot is the bottom. In addition, in the order of five fingers, the thumb is the first and the little finger is the fifth, so the first and second joints may be the joints of the thumb and index finger in addition to the interphalangeal joints of the fingers.

Third: finger joint usually does not say which segment, but the proximal or distal interphalangeal joint of which finger, such as the proximal interphalangeal joint of index finger, is the joint formed by the distal part of proximal phalanx of index finger and the base of middle phalanx. The thumb has only one interphalangeal joint. The other fingers have proximal and distal interphalangeal joints. The base of proximal phalanx and metacarpal head form the metacarpophalangeal joint, which is called the 1st-5th metacarpophalangeal joint from the radial side to the ulnar side.

matters needing attention

After knowing the above knowledge, it is equivalent to figuring out where the first joint of the thumb is. In this way, when people ask you questions about this aspect, they won't say that they don't know everything and make others laugh.