4. Muscles Of The Hand Flashcards
Which nerve innervates the thenar muscles?
Median nerve
How many thenar muscles are there?
3
What does the belly of the thenar muscles form?
Thenar eminence
Name the 3 thenar muscles.
- Opponens pollicis
- Abductor pollicus brevis
- Flexor pollicis brevis
Which nerve innervates the hypothenar muscles?
Ulnar nerve
Which nerve innervates the interossei muscles?
Ulnar nerve
What is the clinical sign of a scaphoid fracture?
Tenderness in anatomical snuffbox
Which part of the scaphoid is at risk of necrosis after a scaphoid fracture?
Proximal part
How many dorsal interossei muscles are there?
4
What is the action of the dorsal interossei muscles?
Abduction of the fingers at the MCP joint
How many palmer interossei muscles are there?
3
What is the action of the palmer interossei muscles?
Adduction of the fingers at the MCP joint
How many lumbricals are there?
4
What are the contents of the anatomical snuffbox?
Radial artery
Radial nerve
Cephalic vein
Which nerve passes through the carpal tunnel?
Median nerve
What is the clinical significance of the carpal tunnel?
Compression of the median nerve within the carpal tunnel can cause carpal tunnel sydrome.
What is the lateral border of the carpal tunnel?
Scaphoid and trapezium tubercles
What is the medial border of the carpal tunnel?
Hook of hamate and pisiform
What forms the roof of the carpal tunnel?
Flexor retinaculum
What is the medial border of the anatomical snuff box?
Extensor pollicus longus
What is the lateral border of the anatomical snuff box?
Extensor pollicus brevis and abductor pollicus longus tendons
What forms the floor of the anatomical snuff box?
Carpal bones - scaphoid and trapezium
What is the proximal border of the anatomical snuff box?
Styloid process of the radius
