what is the muscle between your thumb and pointer finger

A single finger bone is called a phalanx. The MP joint is where the hand bone, called the metacarpal, meets the finger bones, called the phalanges. The radial and ulnar collateral ligaments are important to provide stability of the fingertip during pinching. The terminal extensor tendon in the thumb comes from the extensor pollicis longus muscle. The IP joint in thumb is located at the tip of the finger just before the fingernail starts. The thumb interphalangeal (IP) joint is similar to the distal interphalangeal (DIP) joint in the fingers. The thumb digit has only two phalanges (bones) so it only has one joint. When discussing hand joints, we refer to the palmar or volar surface (the palm side), the dorsal surface (the back of the hand), the radial side (toward the thumb), and the ulnar side (toward the little finger). The tough fibrous tissue is often what is injured when you have a sprain of a joint.

The synovium has multiple functions including to help provide fluid for lubrication of the joint. Our joints typically have a capsule of tough, but flexible, fibrous tissue that helps hold the joints together and an inner lining of synovium. When cartilage is healthy, there is a cushioning effect of the cartilage that absorbs and evens out the forces across the joint. Cartilage is a smooth surface that allows for gliding. The joints in our hands are made up of cartilage surfaces that cap the bones.

What is the muscle between your thumb and pointer finger