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 muscle is the prime mover of dorsiflexion at the ankle joint?

Tibialis anterior

Gastrocnemius

Fibularis longus

Soleus

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Verified step by step guidance

Step 1: Understand the term 'prime mover' in the context of muscle actions. The prime mover, also known as the agonist, is the muscle primarily responsible for producing a specific movement.

Step 2: Define 'dorsiflexion.' Dorsiflexion is the movement that decreases the angle between the dorsum (top) of the foot and the shin, effectively lifting the foot upward at the ankle joint.

Step 3: Review the anatomy of the muscles listed in the options: Tibialis anterior, Gastrocnemius, Fibularis longus, and Soleus. Identify which muscle is anatomically positioned to perform dorsiflexion.

Step 4: Analyze the function of each muscle: The Tibialis anterior is located on the anterior (front) side of the leg and is primarily responsible for dorsiflexion. The Gastrocnemius and Soleus are located on the posterior (back) side of the leg and are involved in plantarflexion (pointing the foot downward). The Fibularis longus contributes to eversion and plantarflexion, not dorsiflexion.

Step 5: Conclude that the Tibialis anterior is the prime mover for dorsiflexion at the ankle joint based on its anatomical position and primary function.