![tendons in your thumb tendons in your thumb](https://post.medicalnewstoday.com/wp-content/uploads/sites/3/2020/02/321162_2200-1200x628.jpg)
The fingers of the hand permit the following movements at the metacarpophalangeal joint (MCP) or knuckle joint. Normal Movementīiomechanics is a term to describe movement of the body. When this fluid becomes infected, a common painful condition known as Bursitis can develop. Bursae contain special cells called synovial cells that secrete a lubricating fluid. It supplies blood flow to the front of the hand, fingers and thumb.īursae are small fluid filled sacs that decrease friction between tendons and bone or skin. Ulnar Artery: The ulnar artery travels next to the ulnar nerve through Guyon’s canal in the wrist.Traveling across the front of the wrist, nearest the thumb, it is this artery that is palpated when a pulse is counted at the wrist. Radial Artery: The radial artery is the largest artery supplying the hand and wrist area.The two main vessels of the hand and wrist are The ulnar nerve supplies feeling to the little finger and half of the ring finger. Ulnar: The ulnar nerve travels through a tunnel in the wrist called Guyon’s tunnel formed by two carpal bones and the ligament that connects them together.Median: The median nerve travels through the wrist tunnel, also called carpal tunnel, providing sensation to the thumb, index finger, long finger, and part of the ring finger.Radial: The radial nerve runs down the thumb side of the forearm and provides sensation to the back of the hand from the thumb to the third finger.The three main nerves responsible for hand and wrist movement all originate at the shoulder area and include the following: Nerves are responsible for carrying signals back and forth from the brain to muscles in our body, enabling movement and sensation such as touch, pain, and hot or cold. The smallest muscles of the wrist and hand are responsible for fine motor movement of the fingers. These muscles are responsible for movement of the thumb and little finger enabling the hand to hold and grip items by allowing the thumb to move across the palm, a movement referred to as Thumb Opposition. Small muscles originating from the carpal bones of the wrist are connected to the finger bones with tendons. Interestingly, the fingers contain no muscles. Muscles are fibrous tissue capable of contracting to cause body movement. The volar plate is the strongest ligament in the hand and prevents hyperextension of the PIP joint. Ligaments are strong rope like tissue that connects bones to other bones and help hold tendons in place providing stability to the joints. Extensor tendons enable each finger to straighten. Tendons are soft tissue that connects muscles to bones to provide support. These include:Ĭartilage: Shiny and smooth, cartilage allows smooth movement where two bones come in contact with each other. Our hand and wrist bones are held in place and supported by various soft tissues. The thumb in the human body only has 2 phalanges and one interphalangeal joint. The second joint nearer the end of the finger is called the distal interphalangeal joint, or DIP joint. The first joint, closest to the knuckle joint, is the proximal interphalangeal joint or PIP joint. Each finger has 3 phalanges separated by two joints. The bones in our fingers and thumb are called phalanges.
![tendons in your thumb tendons in your thumb](https://www.ladanhajipour.com/wp-content/uploads/2016/01/thumb1.jpg)
This joint is commonly referred to as the knuckle joint. Each metacarpal bone connects to one finger or a thumb at a joint called the metacarpophalangeal joint, or MCP joint. These wrist bones connect to 5 metacarpal bones that form the palm of the hand.
![tendons in your thumb tendons in your thumb](https://meded.ucsd.edu/clinicalmed/assets/img/upper_dequervains.jpg)
The wrist is comprised of 8 bones called carpal bones. It is important to understand the normal anatomy of the hand in order to learn about diseases and conditions that can affect our hands.