9: Elbow & Forearm Muscles Flashcards
anterior muscles of the elbow
biceps brachii, brachialis, and brachioradialis
Biceps Brachii OIA
O: (long head)- glenoid fossa, (short head)- coracoid process; I: radial tuberosity; A: elbow and shoulder flexion, supination BIARTICULAR
biarticular
moves two joints
strong, big elbow flexor located beneath the biceps brachii
brachialis
Brachialis OIA
O: lower 1/3 of anterior part of humerus;
I: coronoid process;
A: elbow flexion
Brachioradialis OIA
O: lateral supracondylar ridge of humerus;
I: styloid process of radius;
A: elbow flexion and supination
primary extensor of shoulder and elbow, only posterior muscle of the elbow on upper arm
triceps brachii
Triceps Brachii OIA
O: (long head)-inferior glenoid
(lateral head)-upper lateral posterior 1/2 of humerus
(medial head- lower 2/3 of medial posterior humerus
I: olecranon process;
A: elbow and shoulder extension
posterior muscles of the elbow
triceps brachii, anconeus
Anconeus OIA
O: lateral epicondyle of humerus;
I: olecranon process;
A: elbow extension, assists triceps
small muscle that helps stabilize the elbow joint on the posterior side
anconeus
Supinator OIA
O: lateral epicondyle of humerus, proximal end of ulna;
I: upper lateral 1/3 of radius;
A: supination
bigger lateral muscle of the forearm that wraps around the bones of the forearm, crosses the elbow joint, and performs supination and helps with elbow flexion
supinator
2 pronator muscles
pronator teres and pronator quadratus
Pronator Teres OIA
O: medial epicondyle of humerus, coronoid process;
I: middle of lateral side of radius;
A: pronation
