Arm And Cubital Fossa Muscles Flashcards
Biceps brachii (short head) origin
Tip of coracoid process of scapula (w/coracobrachialis)
Biceps brachii insertion
Tuberosity of radius and fascia of forearm via bicipital aponeurosis
Biceps brachii action
- supinates the pronated forearm
- flexes the supine forearm
- flexes arm
Biceps brachii innervation
Musculocutaneous nerve (C5-7)
Biceps brachii (long head) origin
Supraglenoid tubercle of scapula
Brachialis origin
Distal 1/2 of anterior surface of humerus
Brachialis insertion
Coronoid process of ulna
Brachialis action
Flexes forearm in all positions (main flexor of forearm)
Brachialis innervation
Musculocutaneous nerve (C5-6)
Coracobrachialis origin
Tip of coracoid process of scapula (w/ short head of biceps brachii)
Coracobrachialis insertion
Middle 1/3 of medial surface of humerus
Coracobrachialis action
Helps flex and adduct the arm
Coracobrachialis innervation
Musculocutaneous nerve (C5-6)
Triceps brachii (long head) origin
Infraglenoid process of scapula
Triceps brachii (lateral head) origin
Posterior surface of humerus (superior to radial groove)
Triceps brachii (medial head) origin
Posterior surface of humerus (inferior to radial groove)
Triceps brachii insertion
Proximal end of olecranon of ulna and fascia of forearm
Triceps brachii action
- extends forearm (chief extensor of forearm)
- long head steadies head of abducted humerus and assists in extension and adduction of arm
Triceps brachii innervation
Radial nerve (C6-8)
Anconeus origin
Lateral epicondyle of humerus
Anconeus insertion
- lateral surface of olecranon process
- superior part of posterior surface of ulna
Anconeus action
- assists triceps in extending forearm
- stabilizes elbow joint
- abducts ulna during pronation
Anconeus innervation
Radial nerve (C7-T1)
