Muscles of the Arm That Move the Radius and Ulna Flashcards
(8 cards)
Biceps brachii
Forearm flexors
O- Short head: Coracoid process of scapula
Long head: Supraglenoid tubercle of scapula
I-Tuberosity of radius and aponeurosis of biceps brachii
A-Flex the elbow [humeroulnar joint]
Supinate the forearm [radioulnar joint]
Flex the shoulder [glenohumeral joint]
N-Musculocutaneous C5, 6
Brachialis
Forearm flexors
O-Distal half of anterior surface of humerus
I-Tuberosity and coronoid process of Ulna
A-Flex the elbow [humeroulnar joint]
N-Musculocutaneous, small branch from radial C5, 6
Brachioradials
Forearm flexor
O- Proximal 2/3 of the lateral supracondylar ridge of humerus
I-Styloid process of radius
A-Flex the elbow [humeroulnar joint]
Assist to pronate and supinate the forearm when these movements are resistant
N-Radial C5,6
Triceps brachii
Forearm extensors
O-Long head: Infraglenoid tubercle of scapula
Lateral head: posterior surface of proximal half of the humerus
Medial head: posterior surface of distal half of the humerus
I-Olecranon process of the ulna
A-Radial C6, 7, 8, T1
N-
Anconeus
Forearm extensors
O-Lateral epicondyle of the humerus
I-Olecranon process and posterior, proximal surface of ulna
A-Extend the elbow [humeroulnar joint]
N-Radial C7,8
Pronator teres
Forearm pronators
O-Common flexor tendon from medial epicondyle of humerus and coronoid process of ulna
I-Middle of lateral surface of the radius
A-Pronate the forearm [Radioulnar joint]
Assist to flex the elbow [humeroulnar joint]
N-Median C6,7
Pronator quadratus
Forearm pronators
O-Medial, anterior surface of distal ulna
I-Lateral, anterior surface of distal radius
A-Pronate the forearm [Radioulnar joint]
N-Median C7, 8, T1
Supinator
Forearm supinator
O-Lateral epicondyle humerus, radial collateral ligament, annular ligament and supinator crest of the ulna
I-Anterior, lateral surface of proximal 1/3 of radial shaft
A-Supinate the forearm [Radioulnar joint]
N-Radial C5,6,7
