Muscles Flashcards
Abductor pollicis Brevis
O:Flexor retinaculum, scaphoid, and trapezium
I:the base of the proximal phalanx of the thumb
N:Median nerve
A:Thumb abduction
Abductor digiti minimi
O:pisiform bone
I:Lateral surface of the based of the proximal phalanx the fifth finger
N: Ulnar
A: abduction of fifth finger
Abductor pollicis Longus
O:Posterior radius and ulna
I:Base of Metacarpal
N:Radial Nerve
A:Thumb Abduction
Adductor Pollicis
O: Trapezium, trapezoid, and metacarpal bones II and III
I: Medial surface of the base of the proximal phalanx of the first finger
N:Ulnar nerve
A: Adduction of the first finger
Anconeus
O:Posterior surface of the lateral epicondyle of the humerus
I: Medial surface of the the posterior ulna and olecranon process
N: Radial nerve
A: Assists in elbow extension
Biceps Brachii
O: Short head: coracoid process of the scapula
Long head: supraglenoid tubercle
I: Radial tuberosity of the radius and bicipital aponeurosis
N: Musculocutaneous nerve
A: Elbow flexion, supination of the forearm, weak shoulder flexion at the shoulder joint
Brachioradialis
O: Supracondylar ridge of the humerus
I: Styloid process of the radius
N: Radial nerve
A: Elbow flexion (especially when the radioulnar joint is in a position midway between supination and pronation)
Dorsal interossei
O: Bilaterally on the base of the metacarpals digits I-V
I: Base of the proximal phalanx of digits I-V
N: Ulnar nerve
A: Abduction away from the middle finger
Extensor carpi radialis brevis
O: Lateral epicondyle
I: Third metacarpal (posterior surface)
A: Wrist extension
N: Radial nerve
Extensor carpi radialis Longus
O: Lateral epicondyle
I: Second metacarpal bone (posterior surface)
A: Wrist extension and radial deviation
N: Radial nerve
Extensor carpi ulnaris
O:Lateral epicondyle
I: Fifth metacarpal bone
A: Wrist extension and ulnar deviation
N: Radial Nerve
Extensor digiti minimi
O: Lateral epicondyle of the humerus
I: Distal phalanx of digit 5
N: Radial nerve
A: Extension of all joints of digit 5
Extensor digitorum
O: Lateral epicondyle of the humerus
I: Digits 2-5 at the bases of the second and third phalanges
N: Radial nerve
A: Finger extension, wrist extension
Extensor indicis
O:Distal third of the posterior ulna
I: Distal phalanx of the index finger at the base
N: Radial nerve
A: Extension of the index finger, weak wrist flexion
Extensor pollicis Brevis
O:Posterior surface of the distal radius
I: Proximal phalanx of the thumb on the distal side
N: Radial nerve
A: Extension of the thumb at the metacarpal phalangeal joint, weak wrist extension
Extensor pollicis longus
O: Posterior lateral surface of the ulna
I: Distal phalanx of the thumb at the base
N: Radial nerve
A: Extension of the thumb, extension of the wrist
Flexor carpi radialis
O: Medial epicondyle of the humerus
I: Second and third metacarpal bones
A: Wrist flexion and radial deviation
N: Median nerve
Flexor carpi ulnaris
O: Medial epicondyle of the humerus
I: Pisiform, hamate, and fifth netacarpal bone
A: Wrist flexion and ulnar deviation
N: Ulnar nerve
Flexor digiti minimi
O: Flexor retinaculum, hamate bone
I: Base of the proximal phalanx of the fifth finger
N: Ulnar nerve
A: Flexion of the fifth finger
Flexor digitorum profoundus
O: Upper three-fourths of the anterior surface of the ulna and interosseus membrane
I: Digits 2-5 at the base of the distal phalanges
A: Flexion of the distal interphalangeal joint, whole finger flexion, wrist flexion
N:Digits 2 and 3: median nerve; digits 4 and 5: ulnar nerve
Flexor digitorum superficialis
O: Medial epicondyle of the humerus, coronoid process, radial tuberosity
I: Middle phalanges of digits 2-5
N: Median nerve
A: Finger flexion, assists in wrist flexion, weak elbow flexion
Flexor pollicis Brevis
O: Flexor retinaculum and trapezium bones
I: The base of the proximal phalanx of the thumb
N: Median nerve
A: Thumb flexion
Flexor pollicis Longus
O: Anterior surface of the radius on the distal half
I: Distal phalanx of the thumb at the base
N: Median nerve
A: Flexion of the thumb; wrist flexion
Lubricalis
O: Distal tendon of the flexor digitorum profundus muscle
I: Lateral, proximal base of the proximal phalanx of digits II-V
N: Median and ulnar nerves
A: Flex metacarpophalangeal joints
Opponens pollicis
O: Flexor retinaculum, trapezium bone
I: The head of the first metacarpal bone
N: Median nerve
A: Thumb opposition
Palmar interossei
O: Bilaterally on the base of the metacarpals digits I-V
I: Base of the proximal phalanx of digits I-V
N: Ulnar nerve
A: Abduction away from the middle finger
Palmaris longus
O: Medial epicondyle of the humerus
I: Third metacarpal bone and the palmar aponeurosis
A: Wrist flexion
N: Median nerve
Pronator teres
O: Medial epicondyle of the humerus and medial side of the ulna
I: Lateral surface of the radius
N: Median nerve
A: Pronation of the forearm, weak elbow flexion
Pronator quadratus
O: Distal end of the anterior ulna
I: Distal end of the anterior radius
N: Median nerve
A: Pronation of the forearm
Supinator
O: Lateral epicondyle of the humerus and supinator crest of the ulna
I: Proximal end of the radius on the lateral surface
N: Radial nerve
A: Supination of the forearm
Triceps Brachii
O: Lateral head: approximately halfway down the humerus on the posterior surface
Long head: infraglenoid tubercle on the lateral border of the scapula
Medial head: distal two-thirds of the posterior and medial humerus
I: All heads insert via a central tendon on the olecranon process of the ulna
N: All heads are innervated by the radial nerve
A: Elbow extension, extension of the shoulder joint (long head only)
