Exam 2: Shoulder Joint Flashcards
What are the 3 groups of the deltoid?
Anterior, Middle and Posterior
What is the insertion of the all groups of the deltoid?
Deltoid tuberosity of humerus
What is the origin of the anterior group of the deltoid?
Lateral 1/3 of clavicle
What is the action of the anterior group of the deltoid?
Abduction, flexion, internal rotation, horizontal adduction
What is the origin of the middle group of the deltoid?
Acromion process
What is the action of the middle group of the deltoid?
Abduction, horizontal adduction
What is the origin of the posterior group of the deltoid?
Spine of scapula
What is the action of the posterior group of the deltoid?
Abduction, extension, external rotation, horizontal abduction
What is the origin of the supraspinatus?
Medial 2/3rds supraspinous spinous process of scapula
What is the insertion of the supraspinatus?
Greater tubercle of humerus
What is the action of the supraspinatus?
Abduction and humeral head stabilization
What is the origin of the coracobrachialis?
Coracoid process of scapula
What is the insertion of the coracobrachialis?
Midway down humerus-anteromedial surface
What is the action of the coracobrachialis?
Flexion, adduction and horizontal adduction
What is the origin of the pectoralis major?
Medial half of clavicle, anterior portion of costal cartilages of ribs 1-6 and adjacent portion of sternum
What is the insertion of the pectoralis major?
Lateral lip of intertubercular groove
What is the action of the pectoralis major?
Upper fibers: internal rotation, horizontal adduction, flexion (up to 60 degrees), adduction (w/ arm below 90 degrees of abduction), abduction (above 90 degrees)
Lower fibers: internal rotation, horizontal adduction, adduction and extension
What is the origin of the subscapularis?
Anterior surface of subscapular fossa of scapula
What is the insertion of the subscapularis?
Lesser tubercle of humerus
What is the action of the subscapularis?
Internal rotation, adduction, extension and stabilization
What is the origin of the teres major?
Posterior lower 1/3 of axillary border of scapula
What is the insertion of the teres major?
Medial lip of intertubercular groove
What is the action of the teres major?
Internal rotation, adduction and extension
What is the origin of the latissmus dorsi?
T7-L5, iliac crest and back of sacrum
What is the insertion of the latissmus dorsi?
Medial lip of intertubercular groove
What is the action of the latissmus dorsi?
Adduction, internal rotation, extension and horizontal abduction
What is the origin of the infraspinatus?
Infraspinous fossa of scapula
What is the insertion of the infraspinatus?
Greater tubercle of humerus
What is the action of the infraspinatus?
External rotation, horizontal abduction, extension and stabilization
What is the origin of the teres minor?
Upper 2/3rds of axillary border of scapula
What is the insertion of the teres minor?
Greater tubercle of humerus
What is the action of the teres minor?
External rotation, horizontal abduction, extension and stabilization
What is the origin of the biceps brachii?
Long head: supraglenoid tubercle
Shorts: coracoid process
What is the insertion of the biceps brachii?
Radial tuberosity and bicipital aponeurosis
What is the action of the biceps brachii?
Elbow flexion, supination of forearm, shoulder horizontal adduction, flexion and abduction
What is the origin of the triceps brachii?
Long head: Infraglenoid tubercle of scapula
Lateral head: Upper 1/2 of posterior humerus
Medial head: Lower 2/3rds of posterior humerus
What is the insertion of the triceps brachii?
Olecranon process
What is the action of the triceps brachii?
Elbow extension, shoulder extension, adduction and horizontal abduction
