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Elbow Joint p.152
Lippert ch.11 - Elbow Joint (muscles) pgs. 152-158
Question | Answer |
---|---|
brachialis: ORIGIN | distal half of humerus, anterior surface |
brachialis: INSERTION | coraniod process & ulnar tuberosity of the ulna |
brachialis: ACTION | elbow flexion |
brachialis: NERVE | Musculocutaneous nerve, C5,6 |
biceps brachii: ORIGIN of LONG HEAD | supraglenoid tubercle of scapula |
biceps brachii: ORIGIN of SHORT HEAD | coracoid process of scapula |
biceps brachii: INSERTION | radial tuberosity of radius |
biceps brachii: ACTION | elbow flexion, forearm supination |
biceps brachii: NERVE | Musculocutaneous nerve C5,6 |
brachioradialis: ORIGIN | lateral supracondylar ridge on humerus |
brachioradialis: INSERTION | styloid process of radius |
brachioradialis: ACTION | elbow flexion |
brachioradialis: NERVE | Radial nerve C5,6 |
triceps brachii: ORIGIN of LONG HEAD | infraglenoid tubercle of scapula |
triceps brachii: ORIGIN of LATERAL HEAD | inferior to greater tubercle on posterior humerus |
triceps brachii: ORIGIN of MEDIAL HEAD | posterior surface of humerus |
triceps brachii: INSERTION | olecranon process of ulna |
triceps brachii: ACTION | elbow extension |
triceps brachii: NERVE | Radial nerve C7,8 |
acroneus: ORIGIN | lateral epicondyle of humerus |
acroneus: INSERTION | lateral and inferior to olecranon process of ulna |
acroneus: ACTION | NOT A PRIME MOVER, assists elbow extension |
acroneus: NERVE | Radial nerve, C7,8 |
pronator teres: ORIGIN | medial epicondyle of humerus and coranoid process of ulna |
pronator teres: INSERTION | lateral aspect of radius at midpoint |
pronator teres: ACTION | forearm pronation, assists elbow flexion |
pronator teres: NERVE | Median nerve, C6,7 |
pronator quadratus: ORIGIN | distal 1/4 of ulna |
pronator quadratus: INSERTION | distal 1/4 or radius |
pronator quadratus: ACTION | forearm pronation |
pronator quadratus: NERVE | Median nerve, C8, T1 |
supinator: ORIGIN | lateral epicondyle of humerus & adjacent ulna |
supinator: INSERTION | anterior surface of proximal radius |
supinator: ACTION | forearm supination |
supinator: NERVE | Radial nerve, C6 |
Which muscle is called the "workhorse of the elbow joint" ? | brachialis muscle |
Which head of the biceps brachii descends through the intertubercular (bicipital) groove? | long head |
Which muscle means "arm" in Latin? | brachialis |
Which muscle pulls on the annular ligament to keep it from getting pinched in the olecranon fossa during elbow extension? | acroneus |
What partially wraps around the radius during pronation? | tendon of biceps breachii |
In what position does the elbow have its greatest angular force? | 90 degrees of flexion as it supinates |
Where can the brachialis be palpated? | distal end of the humerus on either side of the biceps tendon |
What is the most superficial muscle on the lateral side of the forearm? | brachioradialis |
Which muscles produce elbow FLEXION? | biceps, brachialis, brachioradialis |
Which muscles produce elbow EXTENSION? | triceps |
Which muscle produce forearm PRONATION? | pronator teres, pronator quadratus |
WHich muscles produce forearm SUPINATION? | biceps, supinator |
lateral epicondylitis | aka: tennis elbow, overuse condition that affects the common extensor tendon where it inserts onto the lateral epicondyle of the humerus, particularly the extensor carpi radialis brevis |
medial epicondylitis | aka: golfer's elbow, overuse condition that results in inflammation of common flexor tendon that inserts into medial epicondyle |
Which overuse condition will produce pain during resisted wrist flexion? | medial epicondylitis |
Little League elbow | overuse injury of medial epicondyle from repetitive throwing, places valgus stress on elbow, causes lateral compression & medial distraction of joint |
pulled elbow | aka: nursemaid's elbow, children <5 experience sudden strong traction force causing radial head to sublux out from under annular ligiment |
elbow dislocation | force at elbow in slightly flexed position causes ulna to slide posterior to distal end of humerus |
supracondylar fractures | distal end of humerus fractures just above condyles (most common fracture in children due to FOOSH) |
Why are elbow dislocations and supracondylar fractures DANGEROUS? | proximity of brachial artery |
Volkmann's ischemic contracture | ischemic necrosis of forearm muscles |