MSK - Upper Limb 3 Flashcards
Where are the 4 lumbricals found and what do they origniante from
- Central compartment
- Tendon of Flexor digitorum profundus
Action and innervation of the lumbricals
- Flexion at metacarpophalangeal joint
- Extension at interphalangeal joint (2nd - 5th digit)
- Medial 2 = Ulnar n.
- Lateral 2 = Median n.
How many dorsal and palmar interossei do you have and what innervates them
- Dorsal = 4
- Palmar = 3
- Ulnar n.
What does DAB and PAD mean
- DAB = Dorsal interossei ABduct the figners
- PAD = Palmar interossei ADduct the fingers
Lesion to wich trunk affects the short muscles of the hand
Lower trunk (C8-T1) = Klumpke’s palsy = Claw hand
Which a. is the main contributor to the superficial and deep palmar arch
- Superficial = Ulanr a.
- Deep = Radial a.
What does the ulnar n. innervate in the hand
- Most of the intrinsic muscles
- Except the thenar muscles 1st+2nd lumbricals (median n.)
What segmental fibres do the ulnar and median nerve both carry
C8 and T1
The ulnar n. is the branch of which cord of the brachial plexus
Medial
What part of the palm do the radial, median and ulnar nerves supply (sensation)
- Radial = Thenar eminence
- Median = Thumb, index, middle, lateral half of ring
- Ulnar = Pinkie, medial hald of ring
Ulnar + median also supply the palm in a similar fashion
Name the carpal bones
- Scaphoid
- Lunate
- Triquetrum
- Pisiform
- Trapezium
- Trapezoid
- Capitate
- Hamate
Movements at the wrist joint
- Flexion + extension
- Abduction + adduction
- Circumduction
Combined action of extensor and flexor carpir ulnaris muscle
Adduction or ulnar deviation
What muscles adduct the wrist
- Flexor carpir radialis
- Extensor carpi radialis longus + brevis
How to identify the supinator muscle
- Deep muscle
- Wrapped around the radius (proximal)
- May look silvery
Muscels that extend or abduct the thumb
- Abductor pollicis longus
- Extensor pollicis longus
- Extensor pollicis brevis
Action of extensor digitorum
Extends medial 4 digits at MCP joint
Action of extensor carpi radialis longus and brevis
Extesion of wrist + abduction
Action of brachioradilais
Supination and elbow flexion
Action of supinator and nerve supply
- Supinates forearm
- Radial nerve
Action of extensor digiti minimi
Extends 5th finger at MP joint
2 carpal bones palppable through the snuff box
Scaphoid and trapezium
What vessel lies on the floor of the snuff box
Radial
What makes up the medial and lateral border of the snuff box
- Medial = Abductor pollicis longus (?+extensor pollicis brevis?)
- Lateral = Extensor pollicis longus
Innervation of extensor pollicis longus and brevis and abductor pollicis longus
Radial nerve
What 4 muscles attatch to the extensor expansion
- Extensor digitorum longus
- Extensor digitorum brevis
- Lumbricals
- Interosei
