Shoulder

Question 1

Deltoid

Answer 1

Origin: Lateral Clavicle, acromion process and spine of scapula

Insertion: Deltoid tuberosity of humerus

Action: Anterior - Flexes and medially rotates arm
Middle - Abducts arm
Posterior - Extends and laterally rotates arm

Nerve: Axillary

Question 2

Supraspinatus

Answer 2

Origin: Supraspinous fossa of scapula

Insertion: Greater tubercle of humerus

Action: Initiates abduction of arm; stabilizes shoulder joint

Nerve: Suprascapular

Question 3

Infraspinatus

Answer 3

Origin: Infraspinous fossa of scapula

Insertion: Greater tubercle of humerus

Action: Laterally rotates arm; stabilizes shoulder joint

Nerve: Suprascapular

Question 4

Teres minor

Answer 4

Origin: Lateral border of scapula

Insertion: Greater tubercle of humerus

Action: Laterally rotates arm; stabilizes shoulder joint

Nerve: Axillary

Question 5

Subscapularis

Answer 5

Origin: Subscapular fossa of scapula

Insertion: Lesser tubercle of humerus

Action: Medially rotates arm; stabilizes shoulder joint

Nerve: Upper and lower subscapular

Question 6

Teres major

Answer 6

Origin: Inferior angle of scapula

Insertion: Medial lip of the interubercular groove

Action: Medially rotates and adducts arm

Nerve: Lower subscapular