Thumb Joints Anatomy

Finger movement is controlled by muscles in the forearms that pull on finger tendons. Three joints of the thumb.

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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.

Thumb joints anatomy. Distal interphalangeal joint dip. The thumb has two of each. The thumb joint has two collateral ligaments as well as the capsule which is lined by a synovial membrane.

Ligaments connect finger bones and help keep them in place. The dip joint is located at the tip of the finger just before the finger nail starts. 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.

The pip joint is the joint just below the dip joint. Break down the words in the name carpometacarpal and you get carpo wrist and metacarpal hand bone. Arthritis can develop at this joint and it is also commonly fractured.

The cmc joint of the thumb is located at the junction point of the thumb and the wrist. Joint capsule of the thumb. Proximal interphalangeal joint pip.

Tendons connect muscles to bones. The ip joint in thumb is located at the tip of the finger just before the fingernail starts. There are nine interphalangeal joints in each hand two on each finger and one in the thumb.

They are responsible for reinforcing the thumb. The collateral ligaments are called the anterior and posterior ligaments. Fingers have a complex anatomy.

Each finger has 3 phalanges bones and 3 hinged joints. Interphalangeal joint ip the thumb digit has only two phalanges bones so it only has one joint. The three joints are as follows.

The thumb interphalangeal ip joint is similar to the distal interphalangeal dip joint in the fingers.

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