Hand Flashcards
Which carpal bone is the most frequently fractured?
Scaphoid. (Scaphoid and Lunate re the only ones that articulate with the radius). Foosh injury.
Which carpal bone is the most frequently dislocated?
Lunate. (Scaphoid and Lunate re the only ones that articulate with the radius)
Which carpal bone has a tubercle attachment for the flexor retinaculum?
Scaphoid and trapezium
Which carpal bone is the keystone of the carpal tunnel? 1st to ossify?
Capitate
Extensor Retinaculum?
Thickening of ante brachial fascia, prevents bow-stringing of extensor tendons. Attached laterally to the radius and medially to the pisiform and triquetrum. Segregated extensor tendons into 6 compartments.
What passes through the carpal tunnel?
9 tendons and 1 nerve: 4 Flexor digitorum superficialis tendons, 4 flexor digitorum profundus tendons, 1 flexor pollicis longus tendon, median nerve.
Flexor retinaculum?
Anterior wall of the carpal tunnel, prevents bowstringing of forearm flexors.
Three things that can lead to carpal tunnel syndrome?
Fluid retention, infection, excessive exercise/repetitive motion
What travels through the Canal of Guyon?
Ulnar nerve and artery.
Where to the lumbricals originate from?
The flexor digitorum profundus tendon.
PAD?
3 palmar Interosseous muscles, that ADDuct, originate from the side of 2nd, 4th and 5th metacarpals, unipenate. Inn: Ulnar nerve
DABS?
4 dorsal interosseous muscles that ABduct the phalanges, originate from the 2nd, 3rd and 4th finders, two heads. Inn: Ulnar nerve
Dermatomes of the hand:
Digit 1: C6
Digit 2 & 3: C7
Digit 4 & 5: C8
Dupuytren’s contracture?
Progressive fibrosus, which typically produces abnormal bands of fibrous tissue from the aponeurosis to the base of the phalanges, puling digits into marked flexion at the metacarpophalangeal joints so they cannot straighten. Possible solution? Cut the aponeurosis.
