Chapter 12 (Wrist Joint) Flashcards
What are the two joints of the wrist?
- radiocarpal
- midcarpal
Describe the radiocarpal joint
- biaxial (frontal/sagittal planes)
- synovial joint
- motions flexion-extension, radial and ulnar deviation
Describe the midcarpal or intercarpal joint
- between two rows of carpal bones
- nonaxial
- gliding motion
What are the joint motions of the wrist?
- flexion
- neutral position
- extension
- ulnar deviation
- radial deviation
What are the bones of the wrist
hint : “Some Lovers Try Positions That They Can’t Handle”
(Proximal row)
-scaphoid -lunate -triquetrum- - pisiform
(Distal row)
-trapezium -trapezoid -capitate -hamate
Why are short bones arranged in an arch?
- Due to the shape/arrangement of bones
- Convexity + ability to oppose the thumb
Styloid Process
distal, lateral end of radius
attachment for collateral ligaments
Hook of hamate
anterior surface of hamate
carpal ligament attachment
***What is the proximal attachment for flexors wrist muscles?
Medial Epicondyle **
***What is the proximal attachment for extensors wrist muscles?
Lateral Epicondyle***
Where is the articular disk?
At distal end of ulna
This encloses radiocarpal joint
Joint capsule
Describe Palmar Fascia
- thick triangular shaped fascia
- located superficially in palm of hand
- covers tendons of extrinsic muscles
- provides protection
What are the muscles of the wrist?
(Anterior)
- flexor carpi ulnaris -flexor carpi radialis
- Palmaris longus
(Posterior)
- extensor carpi radialis longus
- extensor carpi brevis -extensor carpi ulnaris
What is the origin, insertion and action of the Flexor carpi ulnaris muscle?
O:medial epicondyle of humerus
I: pisiform and base of 5th metacarpal
A: wrist flexion an ulnar deviation
What is the origin, insertion and action of the Flexor carpi radialis muscle?
O: medial epicondyle of humerus
I: base of 2nd and 3rd metacarpals
A: wrist flexion and radial deviation
What is the origin, insertion and action of the Palmaris longus muscle?
O: medial epicondyle
I: palmer fascia
A: assist wrist flexion
What is the origin, insertion and action of the Extensor carpi radialis longus muscle?
O: humerus
I: base of 2nd metacarpal
A: wrist extension and radial deviation
What is the origin, insertion and action of the extensor carpi radialis brevis muscle?
O: lateral epicondyle
I: base on 3rd metacarpal
A: wrist extension; assist in radial deviation
What is the origin, insertion and action of the extensor carpi ulnaris muscle?
O: lateral epicondyle
I: base of 5th metacarpal
A:wriist extension and ulnar deviation
What muscles have the action of flexion?
- Flexor carpi radialis
- Flexor carpi ulnaris
What muscles have the action of extension?
- Extensor carpi radialis longus
- Extensor carpi radialis brevis
- Extensor carpi ulnaris
What muscles have the action of radial deviation?
- Flexor carpi radialis
- Extensor carpi radialis longus
What muscles have the action of ulnar deviation?
- Flexor carpi ulnaris
- extensor carpi ulnaris
