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

10. Muscles

Muscle Naming

Anatomy & Physiology

10. Muscles

Muscle Naming

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2:09 minutes

Problem 15

Textbook Question

Name and describe the action of muscles used to shake your head no; to nod yes.

Verified step by step guidance

Identify the muscles involved in shaking your head 'no' (side-to-side movement). These are primarily the sternocleidomastoid muscles, located on both sides of the neck. Each sternocleidomastoid muscle contracts to rotate the head toward the opposite side.

Describe the action of the sternocleidomastoid muscles during the 'no' motion. When the right sternocleidomastoid contracts, it turns the head to the left, and when the left sternocleidomastoid contracts, it turns the head to the right. This alternating contraction creates the side-to-side motion.

Identify the muscles involved in nodding your head 'yes' (up-and-down movement). These include the sternocleidomastoid muscles (for flexion of the neck) and the splenius capitis and trapezius muscles (for extension of the neck).

Describe the action of the sternocleidomastoid muscles during the 'yes' motion. When both sternocleidomastoid muscles contract simultaneously, they flex the neck forward, bringing the chin toward the chest.

Explain the role of the splenius capitis and trapezius muscles during the 'yes' motion. These muscles work to extend the neck, lifting the chin upward and returning the head to a neutral or slightly tilted-back position.

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Key Concepts

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

Muscle Action

Muscle action refers to the specific movements produced by muscles when they contract. In the context of shaking the head 'no' and nodding 'yes', different muscle groups are activated to create these distinct motions. Understanding how muscles contract and relax is essential for analyzing these actions.

Sternocleidomastoid Muscle

The sternocleidomastoid muscle is a key muscle involved in head movement. It runs from the sternum and clavicle to the mastoid process of the skull. When one side contracts, it allows for rotation of the head, facilitating the action of shaking the head 'no'.

Splenius Capitis Muscle

The splenius capitis muscle plays a crucial role in nodding the head 'yes'. This muscle extends from the upper back to the base of the skull and is responsible for extending and rotating the head. Its contraction allows for the upward nodding motion, demonstrating the coordinated action of neck muscles.