Class 4 Flashcards
What are the muscles of the superficial layer of the posterior forearm
Extensor carpi radialis longus Extensor carpi radialis brevis Extensor digitorum Extensor carpi ulnaris Anaconeus
What are the actions of extensor radialis
Extension and abduction
Radial nerve
What are the actions of extensor ulnas
Extension and adduction
Radial nerve
What is the action of extensor digitorum
Extend 4 digits at MCP
Spread fingers to see
Passes under extensor retinaculum
What are the deeper muscles of the posterior forearm
Supinator - lateral epicondyle - radius v close to bone
Extensor pollicis longus - most medial (lateral on dorsal)
Extensor pollicis brevis
Abductor pollicis longus
What innervates the deeper muscles of the posterior forearm
Radial
Where is the supinator muscle
Extremely deep
Starts at ulna and envelops proximal shaft of radius
What deep muscle is most medial in the anatomical snuff box
EPL
What is the action of APL, EPL, and EPB
APL = abduct thumb EPL = extend all joints EPB = extend MCP + IMC
What bones form the floor of the anatomical snuff box
Scaphoid
Trapezium
What lies in the anatomical snuff box
Radius
What is the extensor expansion
4 extensor digitorum tendons flattern to form
What attaches to extensor expansion
Interossi
Lumbricals
What are the muscles of the hand supplied by (+excpetions)
Ulnar
EXCEPT
Thenar muscles (median)
Lumbricals 1+2 (median)
What are the thenar muscles on the lateral part of the palm
Flexor polices brevis - most medial
Abductor polices brevis
Opponens pollicis - most lateral - can’t see
What are the hypothenar muscles
Flexor digiti minimi
Abductor digiti minimi
Opponens digiti minimi - can’t see
What is the adductor pollicis
Very deep muscle to thenar
ADDUCTS thumb
What is the action of the liumbricals
Flex MCP
Extend IP
Where do lumbricals originate from
FDP
What is the action of interossei
Dorsal - abduct
Palmar - adduct
What muscles would you see on dorsal and palm
Dorsal interossei on dorsal
Lumbricals on palm
What arteries supply the hand
Ulnar and radial
Ulnar = superficial palmar arch
Radial = deep palmar arch
What type of joint is the wrist joint
Condyloid
Flexion / extension
Adduction / abduction
What bones are involved in the wrist joint
Radius
Articular disk
Proximal row of carpal bones
