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.
The thumb has two types of joints. It has a hinge joint between the distal phalanx and the proximal phalanx, and between the proximal phalanx and the metacarpal bone, but it has a hinge joint between the metacarpal bone and the carpal bone (specifically the trapezium).
The metacarpels are at the base of the thumb.
Alna
the hitotrolloblockem
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
saddle joint- This joint has two bones that fit together in a special way. It can move in all directions, except rotational. It's what makes us different from monkeys as they can't move their thumbs!
Metacarpo phalngeal joint of Thumb alloys opposition.
Pivot joint is the type found in the neck.
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.
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.
Hinge joint.
The hinge joint.