The thumb joint has two collateral ligaments as well as the capsule which is lined by a synovial membrane. Joint capsule of the thumb.
The thumb possesses a unique and wide range of motion not shared by the hands other digits.
Thumb anatomy joint. They are responsible for reinforcing the thumb. This ligament is responsible for preventing hyperextension. The collateral ligaments are called the anterior and posterior ligaments.
Two very important ligaments are the dorsoradial and the volar beak ligaments. 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 is the first of the hands five digits but it is typically not referred to as a finger.
Break down the words in the name metacarpophalangeal and you get metacarpo hand bone and phalangeal finger bone. The mp joint of the thumb is the middle joint of the thumb located between the cmc joint and the tip of the thumb. 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.
Flexion and extension occur parallel to the palm of the hand. This joint moves a lot in some people and just a little in other people. 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.
The abductor pollicis longus and brevis help move the thumb away from the hand. The thumb cmc joint has the most freedom of motion. But with enough hyperextension force the volar plate can be sprained or ruptured.
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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