The Wrist - o lunate o triquetrum this unit is more mobile...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
The Wrist Capable of a substantial arc of motion But possesses considerable stability Kinematically: o allows for changes in location and orientation of the hand relative to the forearm Kinetically: o transmits forces/loads from the hand to the forearm and vice-versa All joints of the upper extremity function to position the hand in space, but the wrist is the key to versatile hand function. Structure of the Wrist There are eight carpal bones divided into two rows: 1. distal 2. proximal The distal row is made up of four bones: o trapezium o trapezoid o capitate o hamate this is a relatively immobile unit it articulates with the metacarpals all of the bones fit tightly together and are held firm by stout interosseous ligaments The proximal row is made up of two bones:
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
Background image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: o lunate o triquetrum this unit is more mobile it articulates with the radius to form the radiocarpal joint The scaphoid spans both rows The pisiform is a sesmoid bone which enhances the mechanical advantage of the wrists most powerful flexor: o the flexor carpi ulnaris Ligaments In most joints, ligaments restrict joint motion and support joint integrity. In contrast, wrist ligaments: o can induce bony displacements o can transmit precise loads at a distance Palmer ligaments are thick and strong Dorsal ligaments are thin and fewer There are extrinsic ligaments from the radius to the carpus and from the carpus to the metacarpals...
View Full Document

Page1 / 3

The Wrist - o lunate o triquetrum this unit is more mobile...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online