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

13. The Peripheral Nervous System

Introduction to Reflex Arcs

Anatomy & Physiology

13. The Peripheral Nervous System

Introduction to Reflex Arcs

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Multiple Choice

Which of the following reflexes would test the integrity of L₄ to S₂?

downward curling of the toes as a blunt object is drawn downward along the lateral aspect of the foot

lifting a cut foot if you step on a piece of glass

striking the patellar ligament with a reflex hammer

contraction of the muscles of the anterior compartment of the thigh while the posterior compartment muscle relaxes

stroking the skin of the lateral abdomen

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Verified step by step guidance

Understand the spinal nerve roots involved in the reflexes listed. L4 to S2 are lumbar and sacral nerve roots that contribute to the innervation of the lower limb.

Identify the reflexes associated with these nerve roots. The Babinski reflex, which involves the downward curling of the toes, tests the integrity of the L4 to S2 nerve roots.

Consider the reflex arc involved in the Babinski reflex. This reflex is a plantar response that involves the corticospinal tract and is typically tested by drawing a blunt object along the lateral aspect of the foot.

Evaluate the other reflexes mentioned. Lifting a cut foot when stepping on glass is a withdrawal reflex, striking the patellar ligament tests the L2-L4 nerve roots, and contraction of thigh muscles involves different nerve roots.

Conclude that the downward curling of the toes as a blunt object is drawn along the foot is the reflex that tests the integrity of L4 to S2.