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
Pronator Quadratus OIA
O: lower 1/4 of ulna;
I: lower 1/4 of radius;
A: pronation
pronator muscle more proximal to elbow
pronator teres
pronator muscle more distal, closer to the wrist. deepest muscle of the distal forearm
pronator quadratus
tennis elbow
lateral epicondylitis
caused by overuse/repetitive strain from repeated wrist extension. small tears develop in the tendon, leading to irritation and pain where the tendon is attached to the bone
tennis elbow/lateral epicondylitis
little league (golfer’s) elbow
medial epicondylitis
caused by repetitive strain from wrist flexion and overuse of those muscle, causing tears to develop in the muscle tendon, leading to pain and irritation
little league (golfer’s) elbow/medial epicondylitis
