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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2:59 minutes

Problem 30

Textbook Question

Mary's newborn is having trouble suckling. The doctor suggests that it may be a problem with a particular muscle. What muscle is the doctor probably referring to?
(a) Orbicularis oris
(b) Buccinator
(c) Masseter
(d) Risorius
(e) Zygomaticus

Verified step by step guidance

Step 1: Understand the function of suckling in newborns. Suckling involves creating a seal around the nipple and generating suction to draw milk. This requires coordination of facial muscles.

Step 2: Review the functions of the listed muscles: (a) Orbicularis oris is responsible for closing the lips and forming a seal, which is essential for suckling. (b) Buccinator helps compress the cheeks, aiding in suction. (c) Masseter is a chewing muscle, primarily involved in mastication, not suckling. (d) Risorius is involved in facial expressions, such as smiling, and does not contribute to suckling. (e) Zygomaticus also contributes to facial expressions, like smiling, and is not directly involved in suckling.

Step 3: Eliminate muscles that are not directly involved in suckling. Based on their functions, masseter, risorius, and zygomaticus can be ruled out.

Step 4: Focus on the orbicularis oris and buccinator muscles. Both play roles in suckling, but the orbicularis oris is particularly critical for forming a seal around the nipple, which is the primary action required for suckling.

Step 5: Conclude that the doctor is likely referring to the orbicularis oris muscle, as it is the most essential muscle for creating the seal necessary for suckling.

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Key Concepts

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

Suckling Mechanism

Suckling is a reflex action in newborns that involves the coordinated movement of the mouth and tongue to extract milk from the breast. This process relies on the proper functioning of several oral muscles, which must work together to create the necessary suction and rhythm for effective feeding.

Orbicularis Oris

The orbicularis oris is a circular muscle around the mouth that plays a crucial role in lip movement, including closing the lips and puckering. It is essential for suckling, as it helps create a seal around the nipple, allowing the infant to draw milk effectively.

Muscle Function in Feeding

Different muscles in the face and mouth contribute to feeding functions. While the masseter is primarily involved in chewing, the buccinator helps in keeping food between the teeth. Understanding the specific roles of these muscles is vital for diagnosing feeding difficulties in newborns.

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Related Practice

Textbook Question

Name two muscles in each of the following compartments or regions:

a. thenar eminence (ball of thumb)

b. posterior compartment of forearm

c. anterior compartment of forearm—deep muscle group

d. anterior muscle group in the arm

e. muscles of mastication

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Textbook Question

When Mrs. O'Brien returned to her doctor for a follow-up visit after childbirth, she complained that she was incontinent (having problems controlling her urine flow) when she sneezed. The physician asked his nurse to give Mrs. O'Brien instructions on how to perform exercises to strengthen the muscles of the pelvic floor. To which muscles was he referring?

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Textbook Question

As Kendra's coach watched her sail over the high jump bar, he contracted his right orbicularis oculi muscle, raised his arm, and contracted his opponens pollicis. Was he pleased or displeased with her performance? How do you know?

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Textbook Question

The muscles of the vertebral column include many posterior extensors but few anterior flexors. Why?

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Textbook Question

If 'adductor' is part of the name of a muscle, what does that tell you about the muscle?

a. It is a wide muscle.

b. It is a long muscle.

c. It raises a body part.

d. It pulls a body part toward the midline.