Upper Limb 4 Flashcards
What are the muscles of the posterior superficial compartment of the forearm?
extensor carpi radialis longus
extensor carpi radialis brevis
extensor digitorum
extensor carpi ulnaris
What are the muscles of the posterior deep compartment of the forearm?
supinator
abductor pollicis longus
extensor pollicis longus
extensor indicis
extensor pollicis brevis
What is the origin, insertion, action, innervation of the extensor carpi radialis longus?
O: lateral supracondylar ridge
I: 2nd metacarpal
A: extension and abduction hand
IN: radial nerve
What is the origin, insertion, action, innervation of the extensor carpi radialis brevis?
O: lateral epicondyle humerus
I: 3rd metacarpal
A: extension and abduction hand
IN: radial nerve
What is the origin, insertion, action, innervation of the extensor digitorum?
O: lateral epicondyle humerus
I: expansion of medial 4 digits
A: extension at MCP and wrist joint
IN: radial nerve
What is the origin, insertion, action, innervation of the extensor carpi ulnaris?
O: lateral epicondyle humerus
I: 5th metacarpal
A: extension and adduction hand
IN: radial nerve
What is the origin, insertion, action, innervation of the supinator?
O: lateral epicondyle humerus & ulna
I: 1/3 of radius
A: supination
IN: radial nerve
What is the origin, insertion, action, innervation of the abductor pollicis longus?
O: ulna
I: 1st metacarpal
A: abduction and extension thumb
IN: radial nerve
What is the origin, insertion, action, innervation of the extensor indicis?
O: ulna
I: expansion of 2nd digit
A: extension 2nd digit
IN: radial nerve
What is the origin, insertion, action, innervation of the extensor pollicis longus?
O: 1/3 ulna
I: distal phalanx of thumb
A: extension distal phalanx of thumb
IN: radial nerve
What is the origin, insertion, action, innervation of the extensor pollicis brevis?
O: radius
I: proximal phalanx of thumb
A: extension proximal phalanx of thumb
IN: radial nerve
What are the structures in the anatomical snuffbox?
radial artery
radial nerve
scaphoid bone
- tendons of EPL, APL, EPB
What are the extrinsic muscles that act on the thumb?
flexor pollicis longus
abductor pollicis longus
extensor pollicis longus
extensor pollicis brevis
What are the intrinsic muscles that act on the hand?
abductor pollicis brevis (thenar muscles)
flexor pollicis brevis
opponens pollicis
adductor pollicis
abductor digiti minimi (hypothenar muscles)
opponens digiti minimi
flexor digiti minimi
What is the origin, insertion, action, innervation of the abductor pollicis brevis?
O: scaphoid and trapezium
I: proximal phalanx of thumb
A: abduction thumb
IN: median nerve
What is the origin, insertion, action, innervation of the flexor pollicis brevis?
O: scaphoid and trapezium
I: proximal phalanx of thumb
A: flexion thumb
IN: median nerve
What is the origin, insertion, action, innervation of the opponens pollicis?
O: scaphoid and trapezium
I: lat side 1st metacarpal
A: oppose thumb toward centre
IN: median nerve
What is the origin, insertion, action, innervation of the adductor pollicis?
O: (oblique) 2nd metacarpal & (transverse) 3rd metacarpal
I: medial side 1st metacarpal
A: adduct
IN: ulnar nerve
What is the origin, insertion, action, innervation of the abductor digiti minimi?
O: pisiform
I: proximal phalanx of 5th digit
A: abduction
IN: ulnar nerve
What is the origin, insertion, action, innervation of the flexor digiti minimi brevis?
O: hamate
I: proximal phalanx of 5th digit
A: flexion
IN: ulnar nerve
What is the origin, insertion, action, innervation of the opponens digiti minimi?
O: hamate
I: medial 5th metacarpal
A: opposition
IN: ulnar nerve
What are the palmar muscles?
lumbricals and interosseus
What are the 7 interossei?
3 palmar interossei (PAD) adduction
4 dorsal interossei (DAB) abduction
- ulnar nerve
What are the lumbricals?
- flexion at MCP + extension at IP
- 1/2 (lateral) = median nerve
- 3/4 (medial) = ulnar nerve
