rotator cuff muscles

Question 1



Supraspinatus

Answer 1



Origin:Supraspinous fossa
insertion: Greater tubercle
action: Abduct

Question 2

Infraspinatus

Answer 2

Origin: Infraspinous fossa
insertion: Greater tubercle
innervation:Suprascapular
action: Lateral rotate Horizontal Abduct

Question 3

Teres minor

Answer 3

Origin: Superior half of axillary border
Insertion :Greater tubercle
innervation: axillary nerve
action: Lateral rotate Horizontal Abduct

Question 4

Subscapularis

Answer 4

origin: Subscapular fossa
Insertion: Lesser tubercle
innervation: subscapular
action: Adduct,Medial rotate

Question 5

Deltoid muscle

Answer 5

Origin:
Anterior Part: Anterior border of the lateral third of the clavicle
Medial Part: Lateral border of the acromion process of the scapula
Posterior Part: Inferior edge of the scapular spine

Insertion: The deltoid tuberosity on the lateral surface of the proximal humeral shaft

Action: Shoulder abduction, flexion and extension

Innervation: Axillary nerve (C5, C6)

Blood Supply: Posterior circumflex humeral artery from the axillary artery and the deltoid artery from the
thoraco-acromial artery