Muscles - Upper Extremity Flashcards
Origin of Pectoralis Major
Clavicular Head - Medial Half of clavicle
Sternocostal Head - Manubrium and body of sternum, costal cartilage 2-6, aponeuroses of external oblique
Insertion of pectoralis major
Lateral lip of the intertubercular (bicipital) groove of humerus
Innervation of pectoralis major
Medial and lateral pectoral nerve
Action of pectoralis major
Flexes, adducts, and medially rotates the humerus
Origin of pectoralis minor
3rd, 4th, and 5th ribs
Insertion of pectoralis minor
Coracoid process of scapula
Innervation of pectoralis minor
Medial and lateral pectoral nerves
Action of pectoralis minor
Draws the scapula downward and forward, stabilizes it
Origin of the subclavius
First rib and first costal cartilage
Insertion of the sublcavius
inferior surface of the middle third of the clavicle
Innervation of subclavius
Nerve to the subclavius
Action of the subclavius
Depresses the lateral end of the clavicle, pulls the shoulder anteriorly, stabilizes the clavicle
Origin of the subscapularis
Subscapular fossa
Insertion of the subscapularis
Lesser tubercle of the humerus
Innervation of the subscapularis
Upper and lower subscapular nerves
Action of the subscapularis
Medially rotates the humerus
Origin of biceps brachii
Long head - Supraglenoid tubercle
Short head - Coracoid process of scapula
Insertion of biceps brachii
Radial tuberosity and bicipital aponeurosis
Innervation of biceps brachii
Musculocutaneous
Action of biceps brachii
Flexes and supinates forearm (most powerful supinator), weak flexor
Origin of the brachialis
Anterior surface of the lower half of humerus
Insertion of the brachialis
Ulnar tuberosity and coranoid process
Innervation of the brachialis
Musculocutaneous
Action of the brachialis
Chief flexor of the forearm
Origin of the coracobrachialis
Coracoid process of scapula
Insertion of the coracobrachialis
Medial humerus
Innervation of the coracobrachialis
Musculocutaneous
Action of the coracobrachialis
Flexes and adducts humerus
Origin of the triceps brachii
Long head - infraglenoid tubercle of scapula
Lateral head - posterior humerus above radial groove
Medial head - posterior humerus below radial groove
Insertion of triceps brachii
Olecranon process of ulna
Innervation of triceps brachii
Radial
Action of triceps brachii
Chief extensor of arm
Origin of anconeus
Lateral epicondyle of the humerus
Insertion of anconeus
Olecranon process of the ulna
Innervation of the anconeus
Radial nerve
Action of the anconeus
Extension of the forearm
Origin of the pronator teres
Humeral head - medial epicondyle of humerus (common flexor tendon)
Ulnar head - Coronoid process of ulna
Insertion of the pronator teres
Lateral side of radius
Innvervation of pronator teres
Median nerve
Action of the pronator teres
Pronation and flexion of forearm
Origin of the flexor carpi radialis
Medial epicondyle of humerus (common flexor tendon)
Insertion of flexor carpi radialis
Bases of second and third metacarpals
Innvervation of flexor carpi radialis
Median nerve
Action of flexor carpi radialis
Flexes and abducts the wrist joint
Origin of palmaris longus
Medial epicondyle of humerus (common flexor tendon)
Insertion of palmaris longus
flexor retinaculum and palmar aponeurosis
Innvervation of palmaris longus
Median nerve
Action of palmaris longus
Flexes wrist
Origin of flexor carpi ulnaris
Humeral head - medial epicondyle of the humerus (common flexor tendon)
Ulnar head - olecranon process of ulna
Insertion of flexor carpi ulnaris
Pisisform, hook of hamate, base of fifth metacarpal
Innvervation of flexor carpi ulnaris
Ulnar nerve
Action of flexor carpi ulnaris
Flexes and adducts wrist
Origin of flexor digitorum superficialis
Humeroulnar head - medial epicondyle of humerus (common flexor tendon), olecranon process of ulna
Radial head- anterior radius
Insertion of flexor digitorum superficialis
Middle phalanges of medial four digits
Innvervation of flexor digitorum superficialis
Median nerve
Action of flexor digitorum superficialis
Flexes fingers, knuckles, wrist
Origin of flexor pollicus longus
Anterior radius
Insertion of flexor pollicus longus
Distal phalanx of thumb
Innervation of flexor policus longus
Anterior interosseous branch of median nerve
Action of flexor pollicus longus
Flexes thumb