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 considered the prime mover of dorsiflexion at the ankle joint?

Gastrocnemius

Tibialis anterior

Soleus

Fibularis longus

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Verified step by step guidance

Step 1: Understand the concept of dorsiflexion. Dorsiflexion refers to the movement where the toes are brought closer to the shin, decreasing the angle between the dorsum of the foot and the leg. This movement occurs at the ankle joint.

Step 2: Identify the muscles involved in dorsiflexion. The primary muscle responsible for dorsiflexion is the tibialis anterior, which is located in the anterior compartment of the leg. It plays a key role in lifting the foot upward.

Step 3: Review the functions of the other muscles listed in the problem. The gastrocnemius and soleus are part of the posterior compartment of the leg and are primarily involved in plantarflexion (pointing the toes downward). The fibularis longus is involved in eversion and plantarflexion, not dorsiflexion.

Step 4: Recognize that the tibialis anterior is the prime mover (agonist) for dorsiflexion at the ankle joint. It is the most active muscle during this movement and works in coordination with other muscles like the extensor digitorum longus and extensor hallucis longus.

Step 5: Conclude that the correct answer is the tibialis anterior, as it is the muscle primarily responsible for dorsiflexion at the ankle joint.