Wrist Joint & Hand Ch 12-13 Flashcards
Name the bones of the wrist joint, starting laterally on the proximal row and going medially. Use the same order for the distal row?
Prox row lateral to medial: scaphoid, lunate, triquetrum, pisiform
Distal row lateral to medial: trapezium, trapezoid, capitate, hamate
Which wrist motions occur in the sagittal plane around the frontal axis?
Wrist flexion and extension
Which wrist motions occur in the frontal plane around the sagittal axis?
Wrist radial and ulnar deviation
Which wrist motions occur in the transverse plane around the vertical axis?
No motions occur
Which muscle attach on or close to the medial epicondyle of the humerus?
Flexor carpi ulnaris, flexor carpi radialis, palmaris longus
Which muscle attach on or close to the lateral epicondyle of the humerus?
Extensor carpi radialis longus and brevis
extensor carpi ulnaris
If you were shown a drawing of only a wrist joint, what landmarks could tell you if the drawing were a posterior or anterior view?
If the pisiform and hook of the hamate bone are visible, it would be on the anterior side
Which muscle cross the wrist on the radial side?
Extensor carpi radialis longus and flexor carpi radialis
Which muscle cross the wrist on the ulnar side?
Extensor carpi ulnaris and flexor carpi ulnaris
Which muscle, if present, is very easy to identify but has little functional importance?
The palmaris longus located on the anterior surface in the middle of the wrist
Starting on the anterior surface of the ulnar side and moving in the direction of the radial side, name the wrist muscle that cross the wrist. Go completely around the wrist?
Flexor carpi ulnaris, palmaris longus (flexor digitorum superficialis and profundus deep to it), flexor carpi radialis (abductor pollicis longus, extensor pollicis longus and brevis primarily thumb muscle but cross the wrist), extensor carpi radialis longus and brevis (extensor digitorum), and extensor carpi ulnaris
Why is the ulna not considered part of the wrist joint?
Because an articular disk is located b/t the ulna and the proximal row of carpals
Generally speaking, you use wrist muscle when hammering. However, when extra force is needed, you may use elbow or even shoulder muscles. Why does that create greater force?
You are using a longer lever arm and larger muscles
When hammering overhead why are your wrist ulnar deviators working harder than when hammering at waist level?
You are working against gravity when hammering overhead and with gravity hammering at waist level
The wrist motions have what types of end feels?
for wrist flexion, extension, and ulnar deviation the end feel is soft tissue
for wrist radial deviation the end feel is bony
