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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Problem 5

Textbook Question

Which cranial nerves are (a) sensory only, (b) primarily motor, and (c) mixed?

Verified step by step guidance

Step 1: Understand the classification of cranial nerves based on their function. Cranial nerves can be categorized as sensory (carrying sensory information), motor (controlling muscle movements), or mixed (having both sensory and motor functions).

Step 2: Identify the cranial nerves that are sensory only. These include cranial nerves responsible for senses like smell, vision, and hearing. Examples are the Olfactory nerve (CN I), Optic nerve (CN II), and Vestibulocochlear nerve (CN VIII).

Step 3: Identify the cranial nerves that are primarily motor. These nerves control muscle movements, such as those involved in eye movement or tongue movement. Examples include the Oculomotor nerve (CN III), Trochlear nerve (CN IV), Abducens nerve (CN VI), Accessory nerve (CN XI), and Hypoglossal nerve (CN XII).

Step 4: Identify the cranial nerves that are mixed. These nerves have both sensory and motor components, such as controlling muscles while also transmitting sensory information. Examples include the Trigeminal nerve (CN V), Facial nerve (CN VII), Glossopharyngeal nerve (CN IX), and Vagus nerve (CN X).

Step 5: Summarize the classification: (a) Sensory only: CN I, CN II, CN VIII; (b) Primarily motor: CN III, CN IV, CN VI, CN XI, CN XII; (c) Mixed: CN V, CN VII, CN IX, CN X.

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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 role, such as transmitting sensory information or controlling muscle movements. Understanding their classification is essential for identifying their functions.

Sensory, Motor, and Mixed Nerves

Cranial nerves can be classified into three categories: sensory nerves, which carry sensory information to the brain; motor nerves, which transmit signals from the brain to muscles; and mixed nerves, which contain both sensory and motor fibers. This classification helps in understanding the specific functions and pathways of each cranial nerve.

Function of Specific Cranial Nerves

Each cranial nerve has distinct functions and is designated by Roman numerals I through XII. For example, the olfactory nerve (I) is sensory only, responsible for smell, while the facial nerve (VII) is mixed, controlling facial expressions and conveying taste sensations. Familiarity with these functions is crucial for accurately answering questions about cranial nerves.

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