It is known as the thumb basal joint, also known as the carpometacarpal joint. It is a special
saddle-shaped joint that is formed by the small wrist bone and the first of the three bones in the thumb.
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The metacarpels are at the base of the thumb.
The thumb is made up of two phalanges (one distal phalanx and one proximal phalanx), and one metacarpal. At the "visible base" of the thumb, or where the thumb seems to enter the hand, there is a condyloid synovial joint, which involves the articulation of the proximal phalanx on the first metacarpal. The TRUE base of the thumb is where the first metacarpal articulates with the trapezium (a carpal bone of the hand). This joint is a saddle-type synovial joint.
The base of the thumb, the first phalanx, makes a joint with a carpal bone called the trapezium, and the two articulate in a special joint called a saddle joint. You only have tow of these in your body, one at the base of each thumb.
thumb
The thumb joint is a saddle joint, which allows for a wider range of movement compared to other types of joints. This type of joint allows the thumb to move in multiple directions, facilitating activities like grasping and pinching.
Pivot joint is the type found in the neck.
The CMC joints in the body are joints in the wrist used as bases for the metacarpal bones. You can get more information about this at the Wikipedia. Once on the website, type ":Carpometacarpal joint" into the search field at the top of the page and press enter to bring up the information.
The saddle joint is unique to humans and is located at the base of each thumb. It allows the thumb to touch the pinky finger by crossing over the palm of the hand. This allows humans to produce fine movements including sewing, writing, portrait painting, and anything other type of movement where the hand grasps a tool or the object itself as in pottery or peeling an orange.
pivotal
The type of joint found in the neck is known as a pivot joint. This is what will allow you to move your head in all directions.
Saddle joints allow opposition, which is the movement of the thumb across the palm to touch the tips of the fingers on the same hand. This type of joint provides a wide range of motion and enables fine motor skills in the hand.