Movement lecture 5: Hand and wrist joint Flashcards
Name the carpal bones.
Scaphoid, Lunate, Triquetrum, Pisiform
Trapezium, Trapezoid, Capitate, Hamate
‘Some Lovers Try Positions That They Cannot Handle’
(lateral to medial)
What type of joint is the wrist joint?
Synovial ellipsoid joint
no participation by the ulna
Which ligaments strengthen the joint capsule anteriorly and posteriorly?
Radiocarpal ligaments
What movements are possible at the wrist joint?
Abduction, adduction, circumduction, flexion and extension.
How do the extrinsic muscles of the hand enter?
The carpal tunnel
Which nerve supplies most of the intrinsic muscles of the hand? What are the exceptions to this?
Ulnar nerve
Excluding the thenar muscles and 1st and 2nd lumbricals – these are supplied by the median nerve
Which part of the hand is supplied by the palmar cutaneous branch of the median nerve?
Lateral palm
Which part of the hand is supplied by the recurrent branch of the median nerve.
Thenar muscles
Which part of the hand is supplied by the digital branch of the median nerve?
- 1st and 2nd lumbricals
- Palmar - lateral 3 ½ digits
- Dorsal - distal half of lateral 3 ½ digits
What is the function of the lumbricals?
Flexion at metacarpophalangeal joint and extension at interphalangeal joint.
What are the attachments of the flexor retinaculum?
- Medial attachments pisiform and hook of hamate
- Lateral attachments scaphoid tuberosity and trapezium
Which part of the hand is supplied by the palmar branch of the ulnar nerve?
Medial side of the palm.
Which part of the hand is supplied by the dorsal branch of the ulnar nerve?
Medial side of dorsum and medial 1 1/2 digits.
Which part of the hand is supplied by the superficial branch of the ulnar nerve?
Palmar surface of medial 1 1/2 digits
Palmaris brevis
Which part of the hand is supplied by the deep branch of the ulnar nerve?
Hypothenar muscles, adductor pollicis, interossei and 4th + 5th lumbricals.
Where does the ulnar nerve enter the hand along with the ulnar artery?
Guyon’s canal
What happens as a result of compression of the ulnar nerve at the wrist?
Sensory loss palmer surface of medial 1 ½ digits
Motor weakness in the intrinsic muscle of the hand (except thenar eminence and lateral 2 lumbricals)
Hyperextension of metacarpophalangeal joints of digits 4 and 5 (extension is unopposed due to paralysis of lumbricals) - hand of benediction.
What is the most common way of getting a scaphoid fracture?
FOOSH
What is a Colles fracture?
Fracture of the distal end of the radius
Most common in old people, particularly women due to osteoporosis
Usually the result of falling on an outstretched upper limb
Often, the ulnar styloid process is avulsed
