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

10. Muscles

Muscle Naming

Anatomy & Physiology

10. Muscles

Muscle Naming

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Problem 12

Textbook Question

Which of the following is not a muscle of the rotator cuff?
a. Teres major muscle
b. Teres minor muscle
c. Subscapularis muscle
d. Infraspinatus muscle
e. Supraspinatus muscle

Verified step by step guidance

Step 1: Understand the anatomy of the rotator cuff. The rotator cuff is a group of four muscles and their associated tendons that stabilize the shoulder joint and allow for a wide range of motion. These muscles are: supraspinatus, infraspinatus, teres minor, and subscapularis.

Step 2: Review the function and location of each rotator cuff muscle. For example, the supraspinatus assists in abduction of the arm, the infraspinatus and teres minor are involved in external rotation, and the subscapularis is responsible for internal rotation.

Step 3: Examine the teres major muscle. The teres major is not part of the rotator cuff. It is located near the teres minor but has a different function, primarily assisting in adduction and internal rotation of the arm.

Step 4: Compare the teres major muscle to the other muscles listed in the question. Note that the teres major does not contribute to the stabilization of the shoulder joint, which is a key function of the rotator cuff muscles.

Step 5: Conclude that the teres major muscle is the correct answer to the question, as it is not part of the rotator cuff group.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Rotator Cuff Muscles

The rotator cuff is a group of four muscles and their associated tendons that stabilize the shoulder joint. These muscles include the supraspinatus, infraspinatus, teres minor, and subscapularis. They play a crucial role in shoulder movement and stability, allowing for a wide range of arm motions.

Teres Major vs. Teres Minor

The teres major is often confused with the teres minor but serves a different function. While the teres minor is one of the rotator cuff muscles, responsible for external rotation of the arm, the teres major is not part of the rotator cuff and primarily aids in internal rotation and adduction of the arm.

Shoulder Joint Anatomy

Understanding the anatomy of the shoulder joint is essential for identifying the muscles involved in its movement. The shoulder is a ball-and-socket joint, allowing for extensive mobility, but this also makes it susceptible to injuries. Knowledge of the surrounding muscles, including the rotator cuff, is vital for comprehending shoulder mechanics.