Anterior forearm Flashcards
What nerves supplies the anterior forearm?
- Ulnar nerve supplies FCU and medial half of FDP
- Median nerve serves the rest
What are the muscles of the anterior forearm?
-4 superficial =Pronator teres, Flexi Carpi Radialis, Palmaris longus, Flexi carpi ulnaris
4 Deep = Flexor digitorum superficialis, Flexor digitorum profundus, Flexor pollicis longus, pronator quadratus
Why is the medial epicondyle known as the common flexor origin?
-The 4 superficial anterior forearm muscles originate here which all do flexion
What are the functions of Pronator teres?
- Weak flexion of the wrist
- Pronation
What are the functions of FCR?
- Flexion of the wrist
- Abduction of the hand (radial deviation)
What are the functions of Palmaris longus?
- Flexor of wrist
- Weak forearm flexion
What are the functions of FCU?
- Flexion of wrist
- ADduction of hand (ulnar deviation)
What artery supplies the superficial group of the anterior forearm?
-Ulnar
Which muscle in the forearm is absent in 15% population?
-Palmaris longus
What is the main function of the muscles in the anterior forarm?
-Flexion of the wrist and fingers
What are the functions of FDS?
- Flexion of MCP
- Flexion of proximal IP
What are the functions of FDP?
- Flexion of wrist
- Flexion of MCP
- Flexion of all IPs
What are the functions of FPL?
- Abduction of the wrist
- Flexion of the carpometacarpal joing of the 1st digit
- Flexion of the metacarpophalangeal joint of the 1st digit
- Flexion of the interphalangeal joints
What are the functions of Pronator quadratus?
- Pronation
- Stabilisation of radioulnar joint
How id FDP in relation to FDS?
-FDP beings deep to FDS but becomes superficial as it passes through the tendon if FDS at the digits
Compression of the median nerve at the wrist results in atrophy of which muscles?
-Thenar eminence
What often causes compression of the median nerve at the wrist?
- Repetitive movements
- Continuous gripping of heavy objects
What is the bicipital aponeurosis?
- Fascia at the elbow which protects the brachial artery and median nerve
- Separates superficial structures from deep structures eg medial cubital vein from brachial artery
What forms the carpal tunnel?
- Deep carpal arch
- Superficial flexor retinaculum
Where does the flexor retinaculum originate and insert?
- Scaphoid and trapezium
- Hamate and pisiform
What structures are in the carpal tunnel?
- 4 tendons of FDS
- 4 tendons of FDP
- Median nerve
- Tendon of FPL
