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 the Peripheral Nervous System

Anatomy & Physiology

13. The Peripheral Nervous System

Introduction to the Peripheral Nervous System

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2:59 minutes

Problem 18

Textbook Question

How many pairs of cranial nerves are there? Which are purely sensory? Which activates the chewing muscles? Which helps regulate heart rate and activity of the digestive tract?

Verified step by step guidance

Step 1: Understand that there are 12 pairs of cranial nerves in the human body, each with specific functions. These nerves are numbered I through XII and are named based on their function or structure.

Step 2: Identify the cranial nerves that are purely sensory. These include the Olfactory nerve (I), responsible for the sense of smell, and the Optic nerve (II), responsible for vision. Additionally, the Vestibulocochlear nerve (VIII) is involved in hearing and balance.

Step 3: Determine which cranial nerve activates the chewing muscles. The Trigeminal nerve (V) is responsible for motor functions, including activating the muscles involved in chewing.

Step 4: Identify the cranial nerve that helps regulate heart rate and activity of the digestive tract. The Vagus nerve (X) plays a key role in parasympathetic control of the heart, lungs, and digestive system.

Step 5: Review the functions of each cranial nerve to ensure understanding of their roles, focusing on sensory, motor, and mixed functions as relevant to the problem.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Cranial Nerves

Cranial nerves are a set of twelve pairs of nerves that emerge directly from the brain, primarily responsible for sensory and motor functions of the head and neck. Each cranial nerve has a specific function, which can be sensory, motor, or both. Understanding the roles of these nerves is essential for answering questions about their functions and classifications.

Sensory Nerves

Sensory nerves are responsible for transmitting sensory information from the body to the brain. In the context of cranial nerves, some are purely sensory, meaning they only carry sensory information without any motor function. Identifying which cranial nerves are purely sensory is crucial for understanding their specific roles in sensory perception.

Autonomic Nervous System

The autonomic nervous system (ANS) regulates involuntary bodily functions, including heart rate and digestion. Certain cranial nerves, such as the vagus nerve, play a significant role in the ANS by influencing heart rate and digestive tract activity. Recognizing the connection between cranial nerves and the ANS is vital for understanding how these nerves affect physiological processes.

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What region of the body is served by the dorsal rami of the spinal nerves? By the ventral rami?

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The only cranial nerves that are attached to the cerebrum are the____ nerves.

(a) optic

(b) oculomotor

(d) olfactory

(e) abducens