Upper limb 4 Flashcards
Superficial layer of muscles in posterior forearm (6)
Brachioradialis Extensor carpi radialis longus Extensor carpi radialis brevis Extensor digitorum Extensor digiti minimi Extensor carpi ulnaris
Functions of ECRL + ECRB (2)
Both extend + abduct wrist
Deep layer of muscle in posterior forearm (1)
Supinator
Outcropping of deep layer of muscles in posterior forearm (4)
(think snuffbox)
Abductor pollicis longus
Extensor pollicis longus
Extensor pollicis brevis
Extensor indicis
Functions of extensor digitorum (2)
Extend medial 4 digits
Extend wrist
Functions of
- Abductor pollicis longus (3)
- Extensor pollicis longus (3)
- Extensor pollicis brevis (2)
- Extensor indicis
Abduct thumb, extend thumb at CMC joint, extend wrist
Extend IP + MCP of thumb, extend wrist
Extend MCP of thumb, extend wrist
Extend index finger
Innervation of all muscles in posterior forearm
Radial
Function of extensor digiti minimi
Extend 5th finger at MCP
Function of extensor carpi ulnaris
Extend + adduct wrist
Function of brachioradialis
Weak flexion of elbow
Function of supinator
Supinate forearm
Posterior interosseous nerve is a deep branch of
radial nerve
Radial nerve divides into superficial and deep branches in the cubital fossa
What does the superficial branch supply
Sensation to dorsum of hand
Pathology found in the dorsum of wrist
Synovial cyst/ganglion
What deep muscles of the posterior forearm act on the thumb
APL
EPL
EPB
What muscles form the medial and lateral boundary of the anatomical snuffbox
Medial - EPL
Lateral - APL + EPB
What is the anatomical snuffbox
Shallow depression on lateral aspect of wrist on the dorsum
What 2 carpal bones can you feel in the anatomical snuffbox
Scaphoid
Trapezium
What artery is in the floor of the anatomical snuffbox
Radial artery
In the snuffbox, the scaphoid and radius articulate to form part of the wrist joint
A blow to the wrist usually puts most force on what bone leading to fracture
scaphoid fracture
The 4 tendons of extensor digitorum flatten to form
extensor expansion - triangular aponeurosis
Muscles attaching to the dorsal extensor expansion (5)
Extensor digitorum Lumbricals Extensor indicis Dorsal interossei Palmar interossei
Action of APL on wrist
Extension
Actions of APL on thumb (2)
Abduct thumb, extend thumb at CMC joint,
