Thumb Anatomy Joint
The abductor pollicis longus and brevis help move the thumb away from the hand. The thumb metacarpal can bend and extend the thumb move the thumb away from and toward the hand and spin the thumb on the trapezium.
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Flexion and extension occur parallel to the palm of the hand.
Thumb anatomy joint. The thumb is the first of the hands five digits but it is typically not referred to as a finger. They are responsible for reinforcing the thumb. This joint moves a lot in some people and just a little in other people.
The collateral ligaments are called the anterior and posterior ligaments. This ligament is responsible for preventing hyperextension. The mp joint of the thumb is the middle joint of the thumb located between the cmc joint and the tip of the thumb.
Two very important ligaments are the dorsoradial and the volar beak ligaments. But with enough hyperextension force the volar plate can be sprained or ruptured. Break down the words in the name metacarpophalangeal and you get metacarpo hand bone and phalangeal finger bone.
3135 the hilton law states that any nerve innervating a joint will also innervate the muscles moving that joint 36 the thumb cmc joint receives innervation from the dorsal sensory radial nerve and the volar thenar median. Studies of knee shoulder ankle and wrist joints have established the concept of proprioception in which nerve endings within the joint capsule and the ligaments contribute afferent information to the spinal cord for efferent control of periarticular muscles. The thumb cmc joint has the most freedom of motion.
Joint capsule of the thumb. The thumb possesses a unique and wide range of motion not shared by the hands other digits. The thumb joint has two collateral ligaments as well as the capsule which is lined by a synovial membrane.
The volar plate of the thumb is a very thick ligament that forms the bottom of the interphalangeal joint and separates the joint space from the tendon sheath.
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