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

12. The Central Nervous System

Introduction to the Central Nervous System

Anatomy & Physiology

12. The Central Nervous System

Introduction to the Central Nervous System

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Multiple Choice

How many pairs of spinal nerves transmit sensory and motor messages to and from the spinal cord?

12 pairs

43 pairs

31 pairs

24 pairs

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Verified step by step guidance

Step 1: Understand the structure of the spinal cord and its role in transmitting sensory and motor messages. The spinal cord is divided into regions: cervical, thoracic, lumbar, sacral, and coccygeal.

Step 2: Recall that spinal nerves are paired, meaning there is one nerve on each side of the spinal cord for every segment. These nerves are responsible for transmitting sensory information to the spinal cord and motor commands from the spinal cord to the body.

Step 3: Learn the breakdown of spinal nerve pairs by region: cervical (8 pairs), thoracic (12 pairs), lumbar (5 pairs), sacral (5 pairs), and coccygeal (1 pair). Add these together to determine the total number of pairs.

Step 4: Use the formula to calculate the total number of spinal nerve pairs: \( \text{Total pairs} = 8 + 12 + 5 + 5 + 1 \). This will give the total number of spinal nerve pairs.

Step 5: Confirm that the correct answer is 31 pairs, as this is the sum of all spinal nerve pairs across the regions of the spinal cord.