Rotator cuff muscles

This tutorial covers the anatomy and function of the shoulder joint, focusing on the rotator cuff muscles. It begins with an overview of the shoulder joint's mobility and stability, followed by a detailed look at the bones involved. The tutorial then introduces the rotator cuff muscles, explaining their roles in stabilizing the shoulder and facilitating arm rotation. Each muscle is examined individually, discussing its origin, insertion, function, and innervation. The tutorial concludes with clinical notes on shoulder dislocation, its causes, symptoms, and treatment options.

What is the primary reason for the shoulder joint's high mobility?

• It is a synovial ball and socket joint.

• It is a cartilaginous joint.

• It is a hinge joint.

• It is a fibrous joint.

Which bones form the glenohumeral joint?

• Scapula and clavicle

• Humerus and scapula

• Humerus and clavicle

• Radius and ulna

What mnemonic can help remember the rotator cuff muscles?

• HOPS

• FAST

• RICE

• SITS

Where do the rotator cuff muscles generally originate?

• Sternum

• Humerus

• Scapula

• Clavicle

Which muscle is responsible for initiating abduction of the arm?

• Teres minor

• Supraspinatus

• Subscapularis

• Infraspinatus

What nerve innervates the infraspinatus muscle?

• Median nerve

• Radial nerve

• Suprascapular nerve

• Axillary nerve

What is a common cause of shoulder dislocation in older individuals?

• Lifting heavy objects

• Repetitive overhead movements

• Sleeping in an awkward position

• Falling on outstretched hands