Arm & Forearm Muscles Flashcards
Biceps brachii
Supinates forearm
When supinate, Flexes forearm
Resists dislocation of shoulder (short head)
Musculocutaneous nerve
Coracobrachialis
Flexes & ADducts arm at shoulder joint
Resists dislocation of shoulder joint
Musculocutaneous nerve
Brachialis
Flexes forearm at elbow joint
Musculocutaneous joint Radial nerve (sometimes lateral portions)
Triceps brachii
Extends forearm at elbow joint (main)
Resists dislocation of shoulder joint (long head)
Radial nerve
Anconeus
Assists triceps in extension of forearm
Stabilizes elbow joint
ABducts ulna during protonation
Radial nerve
Match layers (Superficial, Intermediate, Deep) with anterior forearm muscles?
Protonator teres Flexor carpi radialis Flexor digitorum superficialis Flexor digitorum profundus Protonator quaratus Flexor pollicis longus Palmaris longus Flexor carpia ulnaris
Protonator teres - Superficial layer
Flexor carpi radialis - Superficial layer
Flexor digitorum superficialis - Intermediate layer
Flexor digitorum profundus - Deep layer
Protonator quaratus - Deep layer
Flexor pollicis longus - Deep layer
Palmaris longus - Superficial layer
Flexor carpia ulnaris - Superficial layer
Pronator teres
Pronates and flexes forearm at elbow
Median nerve
Flexor carpi radialis
Flexes and ABducts hand at wrist
Median nerve
Palmaris longus
Flexes hand at wrist
Tenses palmar aponeurosis
Median nerve
Flexor carpi ulnaris
Flexes and ADducts hand at wrist
Ulnar nerve
Flexor digitorum superficialis
Flexes middle phalanges at proximal interphalangeal joint
Flexes proximal phalanges at metacarpophalangeal joints
Median nerve
Flexor digitorum profundus
Flexes distal phalanges at interphalangeal joints (power grip)
Median and ulnar nerves
Flexor pollicis longus
Flexes thumb
Median nerve via anterior interosseous nerve
Pronator quadratus
Pronates forearm
Deep fibers bind radius and ulna together
Median nerve via anterior interosseous nerve
Brachioradialis
Flexes forearm when it is pronated
Radial nerve
Extensor carpi radialis longus
Extend and ABduct hand at wrist
Radial nerve
Extensor carpi radialis brevis
Extend and ABduct hand at wrist
Deep branch of radial nerve
Extensor digitorum
Extends medial 4 fingers at metacarpophalangeal joints and somewhat at interphalangeal joints
Posterior interroseus (deep branch radial nerve)
Entensor digiti minimi
Extends 5th finger (pinky) at metacarpophalangeal joint and secondarily at interphalangeal joints
Posterior interroseus nerve (deep branch Radial nerve)
Extensor carpi ulnaris
Extends and ADducts hand at wrist
Posterior interroseus (deep branch radial)
Which are the superficial extensors and which are deep?
Brachioradialis Extensor carpi radialis brevis Extensor digitorum Suppinator Extensor carpi radialis Extensor indicus Extensor digiti minimi Extensor carpia ulnaris Extensor pollicis longus Abductor pollicis longus Extensor pollicis brevis
Brachioradialis - Superficial Extensor carpi radialis brevis - Superficial Extensor digitorum - Superficial Suppinator - Deep Extensor carpi radialis - Superficial Extensor indicus - Deep Extensor digiti minimi - Superficial Extensor carpia ulnaris - Superficial Extensor pollicis longus - Deep Abductor pollicis longus - Deep Extensor pollicis brevis - Deep
Supinator
Supinates forearm (bringing radius back to anatomical position)
Deep branch of radial nerve
Extensor indicis
Independent extension of 2nd finger
Aids in extension of wrist
Posterior interroseus (Deep branch Radial)
Abductor pollicis longus
Abducts thumb
Extends thumb at carpometacarpal joint
Posterior interosseus (deep branch radial)
Extensor pollicis brevis
Extends proximal phalynx of thumb at metacarpophalangeal joint and carpometacarpal joint
Posterior interroseus
Extensor pollicis longus
Extends distal phalynx of thumb at interphalangeal joint, metacarpophalangeal joint and carpometacarpal joint
Posterior interroseus
Injury to which nerve causes wrist drop?
a. Musculocutaneous
b. Ulnar
c. Median
d. Radial
d. Radial
