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 of the following muscles is involved in inversion at the ankle joint?

Fibularis longus

Tibialis anterior

Extensor digitorum longus

Gastrocnemius

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Verified step by step guidance

Step 1: Understand the movement of inversion at the ankle joint. Inversion refers to the movement where the sole of the foot turns inward, toward the midline of the body.

Step 2: Review the primary muscles responsible for inversion. The tibialis anterior and tibialis posterior are the key muscles involved in this movement.

Step 3: Analyze the function of each muscle listed in the options: - Fibularis longus: This muscle is involved in eversion (turning the sole outward) and plantar flexion, not inversion. - Tibialis anterior: This muscle is responsible for dorsiflexion and inversion of the foot. - Extensor digitorum longus: This muscle primarily extends the toes and assists in dorsiflexion, but it does not contribute significantly to inversion. - Gastrocnemius: This muscle is involved in plantar flexion of the foot and flexion of the knee, not inversion.

Step 4: Identify the correct muscle based on its function. Since the tibialis anterior is directly involved in inversion at the ankle joint, it is the correct answer.

Step 5: Confirm your understanding by reviewing the anatomy of the tibialis anterior. It originates from the lateral surface of the tibia and inserts on the medial cuneiform and first metatarsal, allowing it to pull the foot inward during inversion.