Muscles of the Shoulder

Question 0

Supraspinatus

Answer 0

Origin: Supraspinus Fossa of the Scapula
Insertion: Greater Tubercle of the Humerus
Action: Initiates Abduction of Arm, Stabilizes Shoulder Joint
Nerve: Suprascapular

Question 1

Deltoid

Answer 1

Origin: Lateral 1/3 of Clavicle, Acromion, Scapular Spine
Insertion: Deltoid Tuberosity of the Humerus
Action: Flexes and Medial Rotates Arm (Clavicle Part), Abducts Arm (Acromial Part), Extends and Laterally Rotates Arm (Scapular Part)
Nerve: Axillary

Question 2

Infraspinatus

Answer 2

Origin: Infraspinous Fossa of the Scapula
Insertion: Greater Tubercle of the Humerus
Action: Laterally Rotates Arm, Stabilizes Shoulder Joint
Nerve: Suprascapular

Question 3

Teres Minor

Answer 3

Origin: Upper Lateral Border of the Scapula
Insertion: Greater Tubercle of the Humerus
Action: Laterally Rotates Arm, Stabilizes Shoulder Joint
Nerve: Axillary

Question 4

Subscapularis

Answer 4

Origin: Subscapular Fossa of the Scapula
Insertion: Lesser Tubercle of the Humerus
Action: Medially Rotates Arm, Stabilizes Shoulder Joint
Nerve: Upper and Lower Subscapular

Question 5

Teres Major

Answer 5

Origin: Lower Lateral/Inferior Border of the Scapula
Insertion: Medial Lip of the Intertubercular Groove (Bicipital Groove) of the Humerus
Action: Medially Rotates and Adducts Arm
Nerve: Lower Subscapular