Muscles Of Upper Arm And Shoulder Flashcards
What is the insertion of the subclavius?
The acromial end of the clavicle - inferior
What is the action of the subclavius?
Pulls tip of shoulder down and pulls clavicle medially
What is the nerve supply to the subclavius?
Nerve to subclavius
What is the arterial supply to the subclavius?
Clavicular branch of the thoracoacromial artery
What is the origin of the subscapularis?
Subscapular fossa of the scapula
What is the insertion of the subscapularis?
Lesser tubercle of the humerus
What is the action of the subscapularis?
Internal rotation at shoulder
What is the nerve supply to the subscapularis?
Subscapular nerve
What is the arterial supply to the subscapularis?
Subscapular artery
The tendons of which 4 muscles make up the rotator cuff of the shoulder joint?
Subscapularis, supraspinatus, infraspinatus and teres minor
What is the origin of the coracobrachialis?
Coracoid process of the scapula
What is the insertion of the coracobrachialis?
Upper one third of the frontal humerus
What is the action of the coracobrachialis?
Flexion and adduction at shoulder
What is the nerve supply to the coracobrachialis?
Musculocutaneous nerve
What is the arterial supply to the coracobrachialis?
Brachial artery
What is the origin of the supraspinatus?
Supraspinous fossa of the scapula
What is the insertion of the supraspinatus?
Greater tubercle of the humerus
What is the action of supraspinatus?
Abduction of the arm to 15 degrees
What is the nerve supply to the supraspinatus?
Suprascapular nerve
What is the arterial supply to the supraspinatus?
Suprascapular artery
What is the origin of the infraspinatus?
Infraspinous fossa of scapula
What is the insertion of the infraspinatus?
greater tubercle of the humerus
What is the action of the infraspinatus?
External rotation of arm
What is the nerve supply to the infraspinatus?
Suprascapular nerve (C5, C6)
What is the arterial supply to the infraspinatus?
circumflex scapular artery and suprascapular artery
What is the origin of teres minor?
Upper two thirds of lateral margin of scapula
What is the insertion of teres minor?
Greater tubercle of humerus
What is the action of teres minor?
External rotation
What is the nerve supply to teres minor?
Axillary nerve
What is the arterial supply to teres minor?
Circumflex scapular artery and posterior circumflex humeral artery
What is the origin of the long head of biceps brachii?
Supraglenoid tubercle of scapula
What is the insertion of the long head of biceps brachii?
Radial tuberosity
What is the action of the long head of biceps brachii?
Flexion of elbow and shoulder, supinator of forearm
What is the nerve supply to the long head of biceps brachii?
Musculocutaneous nerve
What is the arterial supply to the long head of biceps brachii?
Brachial artery
What is the origin of the short head of biceps brachii?
Coracoid process of scapula
What is the insertion of the short head of biceps brachii?
Radial tuberosity
What is the action of the short head of biceps brachii?
Flexion of elbow and shoulder, supination of forearm
What is the nerve supply to the short head of biceps brachii?
Musculocutaneous nerve
What is the arterial supply to the short head of biceps brachii?
brachial artery
What is the origin of the deltoid?
Acromion, crest of the spine of the scapula and the lateral one third of the clavicle
What is the insertion of the deltoid?
Deltoid tuberosity of the humerus
What is the action of the deltoid?
Abduction
Via anterior fibres = Flexion
Via posterior fibres = Extension
What is the nerve supply to the deltoid?
Axillary nerve
What is the arterial supply to the deltoid?
Posterior circumflex humeral artery
What is the origin of the teres major?
Dorsal surface of the inferior angle of the scapula
What is the insertion of teres major?
Crest of the lesser tubercle of the humerus
What is the action of teres major?
Internal rotation, adduction and extension of shoulder
What is the nerve supply to teres major?
Subscapular nerve
What is the arterial supply to teres major?
Circumflex scapular artery and subscapular artery
What is the origin of the subclavius?
Costal cartilage and first rib
What is the origin of the brachialis?
Distal anterior humerus
What is the insertion of the brachialis?
Coronoid process of ulna
What is the action of brachialis?
Flexion at elbow
What is the nerve supply to brachialis?
Musculocutaneous nerve
What is the arterial supply to brachialis?
Brachial artery
Where does the triceps insert?
Olecranon fossa