Forearm (Extensor) Flashcards
Nerve to all posterior forearm muscles
Radial
Posterior forearm muscles do
Extension and supination
Which is the only flexor in the posterior forearm compartment
Brachioradialis (anterior arm, but in posterior compartment as fascia of post goes reasonably anteiror)
Superficial Extensor Forearm
Brachioradialis
Anconeus
Extensor Carpi Radialis Longus
Extensor Carpi Radialis Brevis
Extensor Digitorum
Extensor Digiti Minimi
Extensor Carpi Ulnaris
Deep Extesnor Forearm Muscles
Supinator
Abductor Pollicis Longus
Extensor Pollicis Brevis
Extensor Pollicis Longus
Extensor Indicis
Anconeus Origin
Suprachondyle Ridge
Extensor Carpi Radialis Longus Origin
Suprachondyle Ridge
Extensor Carpi Radialis Brevis Origin
Common Extensor Tendon
Extensor Carpi Ulnaris Origjn
Common Extensor Tendon
Extensor digiti Minimi Origin
Common Extensor Tendon
Extensor Digitorum Origin
Common Extensor Tendon
ECRL Insertion
2nd Metacarpal
ECRB Insertion
3rd Metacarpal
ECU Insertion
5th Metacarpal
EDM ED EI Insertion
DDEH
Where does the radial nerve re-enter the extensor compartment
Between the two heads of supinator
What causes wrist drop
Radial Nerve damage
Why do you need the extensors when flexing for a power grip
You need the flexors to have optimal length to get maximal strength (Marie Ward)
Anatomical Snuff Box Tendons
EPL EPB APL
Clinical use of anatomical snuff box
Tendons of the snuff box attach to the scaphoid which is the most commonly damaged carpal
Abductor Pollicis Longus Insertion
1st metacarpal
Extensor Pollicis Brevis Insertion
Proximal Phalanx
Extensor Pollicis Longus Insertion
Distal Phalanx
Carpi Muscles that Abduct
FCR ECRB ECRL
Carpi Muscles that Adduct
FCU ECU
Radial Nerve goes Lateral between
Brachialis and Brachioradialis
Radial Nerve Divides into ____ and ____ branches at _____
Deep - Supinator, ECRB
Superifical - cutaneous
Divides at Supinator (right after becoming posterior again)
Deep Radial becomes _____
Posterior Interosseous Nerve, which supplies all other ‘Radial Nerve’ muscles
