Nerves 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 three main nerves responsible for hand and wrist movement all originate at the shoulder area and include the following: 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.
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. The ulnar nerve supplies feeling to the little finger and half of the ring finger. Blood Vessels The two main vessels of the hand and wrist are Radial Artery : The radial artery is the largest artery supplying the hand and wrist area.
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. It supplies blood flow to the front of the hand, fingers and thumb. Bursae Bursae are small fluid filled sacs that decrease friction between tendons and bone or skin.
Normal Movement Biomechanics is a term to describe movement of the body. Flexion : Moving the base of the finger towards the palm. Extension : Moving the base of the fingers away from the palm. Adduction : Moving the fingers toward the middle finger. Abduction : Moving the fingers away from the middle finger. Flexion : Moving the last two segments of the finger towards the base of the fingers. Extension : Moving the last two segments of the finger away from the base of the fingers.
Biomechanics of the wrist include the following Flexion : Moving the palm of the hand towards the front of the forearm. Extension : Moving the back of the hand towards the back of the forearm.
Adduction : Moving the pinky side of the hand toward the outer aspect of the forearm. Abduction : Moving the thumb side of the hand toward the inner aspect of the forearm. At this articulation, the following movements can be performed Abduction : Moving the bone below the thumb towards the palm of the hand.
Extension : Moving the bone below the thumb away from the hand. We are unable to redeem your access code. Please try again another time. Please take a moment to tell us about your experience with AclandAnatomy! Yes No. Tell us who you are. May we contact you about your feedback? Your feedback has been successfully submitted. We are unable to receive your feedback at this time.
This site uses cookies. By continuing to use our website, you are agreeing to our privacy policy. Occasionally, joint pain can be caused by a CMC boss. The DIP joint in the finger is located at the tip of the finger, just before the finger nail starts. The middle finger MCP joint is the most common finger it can happen to any finger to have a radial sagittal band injury.
This results in the extensor tendon snapping to the pinky side of the hand. The ring finger CMC joint has much more motion than the index or middle fingers. This permits the hand to change its shape and adapt to grasping objects of different size and shape.
Because this joint is more mobile, it is more common to have a fracture or dislocation of this joint. CMC bossing does not typically occur at this joint.
The small finger CMC joint has the most motion of any finger joint, with the exception of the thumb. This makes the hand more flexible. Because this joint is more mobile it is more common to have a fracture or dislocation, particularly when you hit a hard object.
CMC bossing is a problem that does not typically occur at this joint. The radiocarpal joint consists of the radius, one of the forearm bones, and the first row of wrist bones consisting of the scaphoid, lunate, and triquetrum. There is also a fourth bone in the first row of wrist bones called the pisiform, but it does not connect to either the radius or ulna.
Wrist fractures that involve the joint surface are common wrist injuries. One of the most common ligaments involved in a wrist sprain is the scapholunate ligament.
The ulnocarpal joint includes the ulna, one of the forearm bones, as well as the lunate and triquetrum. Ulnocarpal injuries are common with sprains. A broken wrist fracture that collapses and tilts can cause the ulna to be longer than the radius, which causes extra stress and pain, even after the fracture heals and stops hurtig. Some people who are born with, or develop, an ulna that is longer than the radius can have pain or even have ulnocarpal abutment impaction syndrome.
The distal radioulnar joint is at the wrist where the two forearm bones meet. Distal radioulnar joint instability or pain can sometimes be a challenging problem to treat. The scaphotrapeziotrapezoid joint is at the base of the thumb in the wrist. It is made up of three wrist bones, the scaphoid, the trapezium, and the trapezoid. Citation, DOI and article data.
Kusel, K. Interphalangeal joint of the hand. Reference article, Radiopaedia. URL of Article. On this page:. Susan Standring. Gray's Anatomy. Keith L.
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