Anatomy Of Thumb Bones

If you look at the x-ray image below the carpal bone that is closest to the thumb is carpal bone 8. The thumb has two of each.

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Anatomically the thumb is compromised of the metacarpal connected to the trapezium a carpal bone in the wrist.

Anatomy of thumb bones. The skeleton of the thumb consists of the first metacarpal bone which articulates proximally with the carpus at the carpometacarpal joint and distally with the proximal phalanx at the metacarpophalangeal joint. Two very important ligaments are the dorsoradial and the volar beak ligaments. The flexor pollicis brevis has a short but well-formed distal tendon with the myotendinous junction just proximal to the first MCP joint.

Anatomically the thumb is compromised of the metacarpal connected to the trapezium a carpal bone in the wrist. There are five separate metacarpophalangeal joints that connect each metacarpal bone to the corresponding proximal phalanx of each finger. Abduction adduction flexion and opposition.

Anatomy of the fingers finger bones. The thumb proximal phalanx is a short and stout bone between the metacarpal and distal phalanx. Watch the following video to learn more about the thenar muscles.

The palmar or front-facing surface of the trapezium holds an attachment to the flexor carpi radialis tendon the transverse carpal ligament and muscles including opponens pollicis and flexor pollicis brevis. Fingers have a complex anatomy. Break down the words in the name metacarpophalangeal and you get metacarpo- hand bone and phalangeal finger bone.

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 second bone proximal phalange extends from the knuckle to the base of the thumb. The abductor pollicis longus and brevis help move the thumb away from the hand.

Intermediate phalanx is the middle finger bone which is absent in the thumb. This connects to the thumbs. Because fingers are used for many everyday activities they are at higher risk than other parts of the body for traumatic injury including sports injuries workplace injuries and other accidents.

Also on the palmar surface of the hand the thenar eminence has a corresponding fleshy region on the ulnar side of the hand. These bones consist mostly of long bones except for the eight bones of the wrist called carpals which anatomists classify as short bones. The bulbous tuft at the end of the bone gives the thumb its rounded end.

The red lines show where the tendons attach the muscles to the bones. The bones of the hand and wrist can be broken down into 14 phalanges 5 metacarpals and 8 carpals. The first metacarpal bone radial to the extensor pollicis brevis and partly into the trapezium.

The inferior surface touches the first metacarpal bone also known as the thumb. Each finger has 3 phalanges bones and 3 hinged joints. The first bone distal phalange extends from the tip of the thumb to the knuckle.

Inserts at the base of the proximal phalanx of the thumb and is responsible for extension of the thumb. The thenar muscles are capable of various thumb movements. Metacarpophalangeal joint Articulationes metacarpophalangeae The metacarpophalangeal joints MCP are a collection of condyloid joints that connect the metacarpus or palm of the hand to the fingers.

Each metacarpophalangeal joint is formed by the. A joint is formed when two bones meet and articulate which allows movement. The key here is to remember that trapezium rhymes with thumb or Trapezium is near the thumb.

The extensor pollicis brevis. The thumb CMC joint has the most freedom of motion. Many of the muscles that move the fingers and thumb originate in the forearm.

Joints are lined with smooth cartilage that allows for the easy movement of one bone relative to another. This first metacarpal connects to the proximal phalanx. Finger fractures may account for up to 10 of all bone fractures.

Ligaments connect finger bones and help keep them in place. The hand bones are known as the metacarpals and correspond to the phalanges the first metacarpal articulates with the proximal phalanx of the first finger. Tendons connect muscles to bones.

A joint is formed when two bones meet and articulate which allows movement. Long flexor tendons extend from the forearm muscles through the wrist and attach to the small bones of the fingers and thumb. Distal phalanx is the last finger bone lying furthest away from the hand.

This joint moves a lot in some people and just a little in other people. The flexor pollicis brevis attaches to the proximal phalanx of the thumb and the intervening first MCP radial sesamoid bone serving to flex the thumb at the level of the first MCP joint. The third carpal bone that starts with T is trapezium.

This latter bone articulates with the distal phalanx at the interphalangeal joint. The thumb distal phalanx is a short bone with a rounded tuft at the end that makes a joint with the proximal phalanx. Its main function is abduction of the thumb a movement that takes place between the trapezium and the first metacarpal.

Fingers are easily injured and broken fingers are some of the most common traumatic injuries seen in an emergency room. The MP joint of the thumb is the middle joint of the thumb located between the CMC joint and the tip of the thumb. There is no middle phalanx in the thumb.

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