Quiz 5: Upper Extremity Flashcards
Biceps brachii long head origin
supraglenoid tubercle of scapula
Biceps brachii long head insertion
radial tuberosity and bicipital aponeurosis
Biceps brachii long head action
Elbow joint: flexion; supination
Biceps brachii short head origin
coracoid process of scapula
Biceps brachii short head insertion
radial tuberosity and bicipital aponeurosis
Biceps brachii short head action
Shoulder joint: flexion; stabilization of humeral head during deltoid contraction; abduction and internal rotation of humerus
Brachialis origin
Humerus (distal half of anterior surface)
Brachialis insertion
Ulnar tuberosity and bicipital tuberosity
Brachialis action
Flexion at elbow joint
Coracobrachialis origin
Scapula (coracoid process)
Coracobrachialis insertion
Humerus (in line with crest of lesser tubercle)
Coracobrachialis action
Flexion, adduction, internal rotation
Triceps brachii long head origin
Scapula (infraglenoid tubercle)
Triceps brachii medial head origin
Posterior humerus, distal to radial groove; medial intermuscular septum
Triceps brachii lateral head origin
posterior humerus, proximal to radial groove; lateral intermuscular septum
Triceps brachii insertion
olecranon of ulna
Triceps brachii action
Elbow joint: extension - shoulder joint, long head: extension and adduciton
Anconeus origin
Lateral epicondyle of humerus (variance: posterior joint capsule)
Anconeus insertion
olecranon process of ulna (radial surface)
Anconeus action
Extends elbow and tightens its joint
Extensor digitorum origin
Common head (lateral epicondyle of humerus)
Extensor digitorum insertion
Dorsal digital expansion of 2nd to 5th digits
Extensor digitorum action
Wrist: extension - MCP, PIP, and DIP of 2nd to 5th digits: extension/abduction of fingers
Extensor digiti minimi origin
Common head (lateral epicondyle of humerus)
extensor digiti minimi insertion
dorsal digital expansion of 5th digit
Extensor digiti minimi action
Wrist: extension, ulnar abduction of hand MCP, PIP, and DIP of 5th digit: extension and abduction of 5th digit
Extensor carpi ulnaris origin
Common head (lateral epicondyle of humerus) - ulnar head (dorsal surface)
Extensor carpi ulnaris insertion
Base of 5th metacarpal
Extensor carpi ulnaris action
Wrist: extension, adduction (ulnar deviation) of hand
Supinator origin
Olecranon, lateral epicondyle of humerus, radial collateral ligament, annular ligament of radius
Supinator insertion
Radius (between radial tuberosity and insertion of pronation teres)
Supinator action
Radioulnar joints: supination
Abductor Pollicis Longus origin
Radius and ulna (dorsal surface, interosseous membrane)
abductor pollicis Longus insertion
Base of 1st metacarpal
Abductor pollicis Longus action
Radiocarpal joint: abduction of the hand - carpometacarpal joint of thumb: abduction
Extensor pollicis brevis origin
Radius (posterior surface) and interosseous membrane
Extensor pollicis brevis insertion
Base of distal phalanx of thumb
Extensor pollicis brevis action
Radiocarpal joint: abduction (radial deviation) of hand - carpometacarpal and MCP of thumb: extension
Extensor pollicis Longus origin
ulna and interosseus membrane
Extensor pollicis Longus insertion
Base of distal phalanx of thumb
Extensor pollicis Longus action
Wrist: extension and abduction (radial deviation) of hand - carpometacarpal of thumb: addiction - MCP and IP of thumb: extension
Extensor indices origin
Ulna (posterior surface) and interosseous membrane
Extensor indices insertion
posterior digital expansion of 2nd digit
Extensor indices action
Wrist: extension - MCP, PIP, and DIP of 2nd digit: extension
Brachioradialis origin
Distal humerus (distal surface), lateral intermuscular septum
Brachioradialis insertion
Styloid process of the radius
Brachioradialis action
Elbow: flexion - Forearm: semipronation
Extensor carpi radialis Longus origin
Lateral supracondylar ridge of distal humerus, later intermuscular septum
Extensor carpi radialis longus insertion
2nd metacarpal (base)
Extensor carpi radialis Longus action
Elbow: weak flexion - wrist: extension and abduction
Extensor carpi radialis brevis origin
Lateral epicondyle of humerus
Extensor carpi radialis brevis insertion
3rd metacarpal (base)
Extensor carpi radialis brevis action
Elbow: weak flexion - Wrist: extension and abduction
Pronator teres origin
humeral head: medial epicondyle of humerus
ulnar head: coronoid process
Pronator teres insertion
Lateral radius (distal to Supinator insertion)
Pronator teres action
Elbow: weak flexor
forearm: pronation
Flexor carpi radialis origin
Medial epicondyle of humerus