The Wrist and Hand Joints Chapter 7 Wrist

The Wrist and Hand Joints Chapter 7

Wrist and Hand Terms 1. 2. 3. 4. 5. Carpi Digitorum Pollex Radialis Ulnaris A. Wrist B. Fingers C. Thumb D. Lateral (thumb) E. Medial (little finger)

Bones of the Wrist and Hand

Carpal Bones

Carpal Bones Note the two rows

Carpal Bones • Proximal row from the radial (thumb) to the ulnar (little finger) side • scaphoid (boat shaped) or navicular • lunate (moon shaped) • triquetrum (three cornered) Tp • pisiform (pea shaped) Tz S H C L Tq P Palm of the left hand

Carpal Bones • Distal row from the radial (thumb) to the ulnar (little finger) side • trapezium • trapezoid • capitate (head shaped) Tp • hamate (hooked) Tz S H C L Tq P Palm of the left hand

Carpal Bones • So Long To Pinky, • Here Comes The Thumb

Carpal Bones radial (thumb) side Tp Tz C H S L Tq P radial (thumb) side C H Tq P

Carpal Bones – Scaphoid most often injured – From falling on outstretched hand – Often dismissed as a sprain – Significant problem if not recognized & treated properly – Usually long period of precise immobilization or surgery

Carpal Bones – Carpal bones form a three-sided arch – concave on palmar side – bony arch is spanned by transverse carpal & volar carpal ligaments – creates the carpal tunnel – frequently a source of problems known as carpal tunnel syndrome

Metacarpal Bones 1 2 3 4 5 Metacarpals are identify as 1 st through 5 th

First Metacarpal • Sesamoid bone

Phalanxes • Distal • Middle • Proximal 1, 2, 3, 4, 5 Phalanxes are identify as 1 st through 5 th

Name the Bones • • • 1= Scaphoid 5= Trapezium 10 = Second metacarpal 14 = Proximal phalange 15 = Middle phalange 16 = Distal phalange

Radius styloid process

Ulna styloid process

Styloid Process

Humerus lateral and medial epicondyles

Epicondyles • Medial epicondyle, medial condyloid ridge, & coranoid process - origin for many wrist & finger flexors • Lateral epicondyle & lateral supracondylar ridge - origin for many wrist & finger extensors

The Wrist and Hand Joints

Joints • Wrist joint • condyloid-type joint • allows flexion, extension, abduction, & adduction • motion occurs primarily between distal radius & proximal carpal row (scaphoid, lunate, & triquetrum)

Joints • Each finger has 3 joints – Metacarpophalangeal (MCP) joints – Proximal interphalangeal (PIP) joints – Distal interphalangeal (DIP) joints

Joints • Thumb has 2 joints – Metacarpophalangeal (MCP) joint • Ginglymus – Interphalangeal (IP) joint • Ginglymus

Major Joints • Interphalangeal joints • Distal • Proximal • Metacarpophalangeal joints • Carpometacarpal ( a saddle joint at the thumb) • Radialcarpal joint

Actions of the Wrist and Hand

Wrist Actions

Wrist Actions

Finger Actions

Finger Actions

Thumb Actions • Opposition • movement of thumb across palmar aspect to oppose any or all of the phalanges • Reposition • movement of thumb as it returns to anatomical position from opposition with hand and/or fingers

Name the Finger Actions

Name the Wrist Action

Name the Wrist Action

Name the Actions Fingers W W r Wrist r W Wrist W