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

1. Introduction to Anatomy & Physiology

Anatomical Terms for the Head and Neck

Anatomy & Physiology

1. Introduction to Anatomy & Physiology

Anatomical Terms for the Head and Neck

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Multiple Choice

Which of the following muscles is responsible for closing the jaw in the head and neck region?

Sternocleidomastoid

Frontalis

Platysma

Masseter

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Verified step by step guidance

Step 1: Understand the function of the muscles listed in the question. The masseter is a muscle located in the head and neck region and is primarily responsible for closing the jaw during chewing (mastication). The other muscles listed have different functions.

Step 2: Review the anatomy of the masseter muscle. It originates from the zygomatic arch and inserts onto the lateral surface of the mandibular ramus. Its contraction elevates the mandible, closing the jaw.

Step 3: Compare the functions of the other muscles listed. The sternocleidomastoid is responsible for head rotation and flexion, the frontalis is involved in raising the eyebrows, and the platysma is a superficial neck muscle that helps in facial expressions like lowering the jaw and corners of the mouth.

Step 4: Confirm that the masseter is the correct answer by identifying its role in mastication, which involves closing the jaw—a key function not performed by the other muscles listed.

Step 5: Reinforce the concept by studying the synergistic action of other muscles involved in mastication, such as the temporalis and medial pterygoid, which also assist in jaw movement.