Musculus infraspinatus

The video tutorial discusses the infraspinatus muscle, part of the rotator cuff, which stabilizes the shoulder. It covers the muscle's origin, attachment, innervation by the suprascapular nerve, and its role in external rotation and adduction of the arm. The tutorial also mentions related muscles in the rotator cuff and their collective function in shoulder stability.

What is the primary function of the rotator cuff muscles?

• To extend the knee

• To stabilize the shoulder

• To flex the elbow

• To rotate the wrist

Which muscle is NOT part of the rotator cuff?

• Infraspinatus

• Teres minor

• Biceps brachii

• Supraspinatus

What is the role of the infraspinatus muscle in arm movement?

• Extension

• Flexion

• External rotation

• Internal rotation

Where does the infraspinatus muscle originate?

• On the fossa infra spinata of the shoulder blade

• On the humerus

• On the clavicle

• On the scapular spine

Which nerve innervates the infraspinatus muscle?

• Axillary nerve

• Radial nerve

• Suprascapular nerve

• Ulnar nerve