Muscles of the shoulder

The tutorial explores the anatomy of the shoulder joint, focusing on its bones, muscles, and clinical aspects. It begins with an introduction to the shoulder's flexibility and an overview of the tutorial's content. The bones forming the shoulder joint, such as the humerus and scapula, are discussed, followed by a detailed look at the deltoid and rotator cuff muscles, including their functions and innervation. The tutorial also covers additional muscles that act on the shoulder joint, like the pectoralis major and latissimus dorsi. Clinical notes on common rotator cuff injuries and their treatments are provided, concluding with a summary of the key points covered.

What is a potential downside of increased flexibility in the shoulder joint?

• Improved strength

• Decreased joint stability

• Enhanced endurance

• Reduced range of motion

Which bones form the shoulder joint?

• Humerus and scapula

• Radius and ulna

• Clavicle and sternum

• Femur and tibia

What is the primary function of the clavicular part of the deltoid muscle?

• Rotation of the arm

• Extension of the arm

• Flexion of the arm

• Abduction of the arm

Which nerve innervates the deltoid muscle?

• Radial nerve

• Ulnar nerve

• Axillary nerve

• Median nerve

Which muscle is responsible for initiating abduction of the arm at the shoulder joint?

• Subscapularis

• Teres minor

• Supraspinatus

• Infraspinatus

What is the function of the subscapularis muscle?

• Flexion of the arm

• Lateral rotation of the arm

• Medial rotation of the arm

• Abduction of the arm

Which muscle is known as one of the 'swimming muscles' due to its role in medial rotation, adduction, and extension of the arm?

• Biceps brachii

• Deltoid

• Latissimus dorsi

• Pectoralis major

What is a common cause of tendinitis in the rotator cuff muscles?

• Overuse

• Genetic factors

• Nutritional deficiencies

• Infections

Which muscle originates from the coracoid process of the scapula and assists in flexion of the arm?

• Biceps brachii

• Latissimus dorsi

• Pectoralis major

• Coracobrachialis

What is the primary treatment approach for rotator cuff injuries?

• Chemotherapy

• Conservative management

• Surgical intervention

• Radiation therapy