OP Group 2 Flashcards
Deltoid - Origin
Lateral 1/3 of clavicle, acromion and spine of scapula
Deltoid - Insertion
Deltoid tuberosity of humerus
Deltoid - Action
Abduction of shoulder (middle fibers), flexion and horizontal adduction (anterior fibers), extension and horizontal abduction (posterior fibers)
Deltoid - Innervation
Axillary nerve
Teres Minor - Origin
Superior lateral border of scapula
Teres Minor - Insertion
Greater tubercle of humerus
Teres Minor - Action
Lateral rotation of shoulder, stabilizes glenohumeral joint
Teres Minor - Innervation
Axillary nerve
Biceps Brachii - Origin
Long head: supraglenoid tubercle and glenohumeral labrum; Short head: coracoid process of scapula
Biceps Brachii - Insertion
Radial tuberosity and bicipital aponeurosis
Biceps Brachii - Action
Flexion and supination of elbow, flexion of shoulder
Biceps Brachii - Innervation
Musculocutaneous nerve
Supraspinatus - Origin
Supraspinous fossa of scapula
Supraspinatus - Insertion
Greater tubercle of humerus
Supraspinatus - Action
Abduction of shoulder, stabilizes glenohumeral joint
Supraspinatus - Innervation
Suprascapular nerve
Subscapularis - Origin
Subscapular fossa of scapula
Subscapularis - Insertion
Lesser tubercle of humerus
Subscapularis - Action
Medial rotation of shoulder, stabilizes glenohumeral joint
Subscapularis - Innervation
Upper and lower subscapular nerves
Infraspinatus - Origin
Infraspinous fossa, inferior portion of spine of scapula
Infraspinatus - Insertion
Greater tubercle of humerus
Infraspinatus - Action
Lateral rotation of shoulder, stabilizes glenohumeral joint
Infraspinatus - Innervation
Suprascapular nerve
Teres Major - Origin
Inferior, lateral border of scapula
Teres Major - Insertion
Medial lip of bicipital groove of humerus
Teres Major - Action
Medial rotation and adduction of shoulder
Teres Major - Innervation
Lower subscapular nerve
Pectoralis Major - Origin
Clavicular fibers: medial ½ of clavicle; Sternal fibers: anterior sternum; Costal fibers: costal cartilage of ribs 1-7
Pectoralis Major - Insertion
Lateral lip of bicipital groove of humerus
Pectoralis Major - Action
Adduction and medial rotation of shoulder, horizontal adduction of shoulder
Pectoralis Major - Innervation
Medial and lateral pectoral nerves
What is the origin of the Brachialis muscle?
Anterior distal ½ of humerus
What is the insertion point of the Brachialis muscle?
Ulnar tuberosity and coronoid process of ulna
What is the primary action of the Brachialis muscle?
Flexion of elbow (main elbow flexor)
What nerves innervate the Brachialis muscle?
Musculocutaneous and radial nerve
What is the origin of the long head of the Triceps Brachii?
Infraglenoid tubercle and neck of scapula
What is the origin of the lateral head of the Triceps Brachii?
Upper half of posterior surface of shaft of humerus (above radial groove)
What is the origin of the deep (medial) head of the Triceps Brachii?
Posterior shaft of humerus (below radial groove)
What is the insertion point of the Triceps Brachii?
Olecranon process
What is the primary action of the Triceps Brachii?
Extension of elbow
What is the innervation of the Triceps Brachii?
Radial nerve (axillary nerve - long head)
