Muscles of the shoulder

Question 1

Supraspinatus

Answer 1

Origin - Supraspinous fossa of the scapula
Insertion - Greater tubercle of the humerus
Actions - Stabilise shoulder, shoulder abduction

Question 2

Infraspinatus

Answer 2

Origin - Infraspinous fossa of the scapula
Insertion - Greater tubercle of the humerus
Action - stabilise shoulder, shoulder lateral rotation

Question 3

Teres Minor

Answer 3

Origin - Posterior, lateral border of scapula
Insertion - Greater tubercle of the humerus
Action - Stabilises shoulder and shoulder lateral rotation

Question 4

Subscapularis

Answer 4

Origin - Subscapula fossa of scapula
Insertion - Lesser tubercle of the humerus
Action - Stabilises shoulder, shoulder medial rotation

Question 5

Pectoralis Major

Answer 5

Origin - clavicle, sternum, cartilage of ribs 1-6
Insertion - Greater tubercle of the humerus
Action - Shoulder abduction, medial rotation

Question 6

Deltoid

Answer 6

Origin - Clavicle, acromian, spine of scapula
Insertion - Deltoid tuberosity
Origin - shoulder abduction, shoulder flexion, shoulder lateral/medial rotation

Question 7

Latissimus Dorsi

Answer 7

Origin - Spinous processes (T7-T12, lumbar), Illiac crest
Insertion - Intertubercular sulcus of the humerus
Action - Abductor of shoulder, medial rotation