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 Actions

Anatomy & Physiology

10. Muscles

Muscle Actions

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Multiple Choice

Which of the following is an action of the teres major muscle?

Medial rotation of the humerus

Abduction of the arm

Extension of the forearm

Flexion of the elbow

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Verified step by step guidance

Begin by identifying the location and attachment points of the teres major muscle. The teres major originates from the posterior aspect of the inferior angle of the scapula and inserts into the medial lip of the intertubercular sulcus of the humerus.

Understand the primary actions of the teres major muscle. It is involved in movements such as medial rotation, adduction, and extension of the humerus at the shoulder joint.

Consider the anatomical position and the direction of muscle fibers. The teres major muscle fibers run from the scapula to the humerus, allowing it to pull the humerus medially when contracted.

Evaluate each option based on the known actions of the teres major. Medial rotation of the humerus aligns with the muscle's function, while abduction of the arm, extension of the forearm, and flexion of the elbow do not correspond to the actions of the teres major.

Conclude that the correct action of the teres major muscle is medial rotation of the humerus, as this is consistent with its anatomical role and function.