Muscles of the Glenohumeral Joint Flashcards
What is the origin of the supraspinatus?
Supraspinatus fossa.
What is the origin of the infraspinatus?
Infraspinatus fossa.
What is the origin of the teres minor?
Lateral scapular border.
What is the origin of the subscapularis?
Subscapular fossa.
What is the insertion of the supraspinatus?
Greater tubercle of the humerus.
What is the insertion of the infraspinatus?
Greater tubercle of the humerus.
What is the insertion of the teres minor?
Greater tubercle of the humerus.
What is the insertion of the subscapularis?
Lesser tubercle of the humerus.
What are the actions of the supraspinatus?
Abduction of the humerus.
What are the actions of the infraspinatus?
External rotation of humerus.
What are the actions of the teres minor?
External rotation of the humerus.
What are the action of the subscapularis?
Medial rotation of the humerus.
What innervates the supraspinatus?
Suprascapular nerve
(C5-C6).
What innervates the infraspinatus?
Suprascapular nerve (C5-C6).
What innervates the teres minor?
Axillary nerve (C5-C6).
What innervates the subscapularis?
Upper and lower subscapular nerves (C5-C6).
What is the origin of the latissimus dorsi?
Spinous processes T7 to sacrum via thoracolumbar fascia.
What is the insertion of the latissimus dorsi?
Intertubercular groove of humerus.
What are the actions of the latissimus dorsi?
Adduction, extension, and medial rotation of the humerus at the glenohumeral joint.
What innervates the latissimus dorsi?
Thoracodorsal nerve (C6-C8)
What is the origin of the Pectoralis Major?
Sternum, Clavicle, Costal Margins.
What is the insertion of the Pectoralis Major?
Intertubular groove of the humerus
What are the actions of the Pectoralis Major?
Flexion, adduction, and medial rotation of humerus.
What innervates the Pectoralis Major?
Medial pectoral nerve (C8-T1) and lateral pectoral nerve (C5-C7).
