Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

9. Muscle Tissue

Introduction to Muscles and Muscle Tissue

Anatomy & Physiology

9. Muscle Tissue

Introduction to Muscles and Muscle Tissue

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Multiple Choice

Which rotator cuff muscle is primarily responsible for internal rotation of the shoulder?

Subscapularis

Infraspinatus

Supraspinatus

Teres minor

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Verified step by step guidance

Step 1: Understand the anatomy of the rotator cuff muscles. The rotator cuff consists of four muscles: Subscapularis, Infraspinatus, Supraspinatus, and Teres Minor. Each muscle has a specific function related to shoulder movement.

Step 2: Recall the primary movements of the shoulder joint. These include internal rotation, external rotation, abduction, and stabilization of the humeral head within the glenoid cavity.

Step 3: Identify the muscle responsible for internal rotation. The Subscapularis muscle is located on the anterior surface of the scapula and attaches to the lesser tubercle of the humerus. Its contraction pulls the humerus medially, causing internal rotation of the shoulder.

Step 4: Differentiate the functions of the other rotator cuff muscles. The Infraspinatus and Teres Minor are primarily responsible for external rotation, while the Supraspinatus assists in abduction of the shoulder.

Step 5: Confirm the correct answer based on the function of each muscle. Since internal rotation is the movement in question, the Subscapularis is the correct answer.