Arm Muscles Flashcards
Biceps Brachii
O:
Short head–tip of coracoid process of scapula (w/coracobrachialis)
Long head–supraglenoid tubercle of scapula
I:
Tuberosity of radius
Fascia of forearm via bicipital aponeurosis
A:
Supinates the pronated forearm
Flexes the supine forearm
Flexes the arm
N:
Musculocutaneous C5, C6, C7
Brachialis
O:
Distal 1/2 of anterior humerus
I:
Coronoid process of ulna
A:
Flexes forearm in all positions
MAIN FOREARM FLEXORS
N:
Musculocutaneous C5, C6
Coracobrahialis
O:
Tips of coracoid process of scapula
I:
Middle 1/3 of medial surface of humerus
A:
Helps flex and adduct the arm
N:
Musculocutaneous C5, C6
Triceps Brachii
O:
Long head–infraglenoid process of scapula
Lateral head–posterior surface of humerus, superior to radial groove
Medial head–posterior surface of humerus, inferior to radial groove
I:
Proximal end of olecranon of ulna
Fascia of forearm
A: Extends forearm CHIEF EXTENSOR OF FOREARM Long head steadies head of abducted humerus Assists in extension of arm Adduction of arm
N:
Radial n C6, C7, C8
Anconeus
O:
Lateral epicondyle of humerus
I:
Lateral surface of olecranon process
Superior part of posterior surface of ulna
A:
Assists triceps in extending forearm
Stabilizes elbow joint
Abducts ulna during pronation
N:
Radial n C7, C8 T1
Supinator
O: Lateral epicondyle of humerus Radial collateral and annular ligaments Supinator fossa Crest of ulna
I:
Lateral, posterior and anterior surfaces of proximal 1/3 of radius
A:
Supinates pronated forearm
N:
Deep branch of radial n C7, C8
Brachioradialis
O:
Proximal 2/3 of lateral supraepicondylar ridge of humerus
I:
Lateral surface of distal end of radius to styloid process
A:
Flexes forearm
N:
Radial n C5, C6, C7
Pronator Teres
O:
Medial epicondyle of humerus
Coronoid process of ulna
I:
Middle of lateral surface of radius
A:
Pronates forearm
Assits in flexion of forearm
N:
Median n C6, C7
