Textbook Question
Why is it difficult to lift a heavy object when the elbow is at full extension?
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Ch. 11 The Muscular System
Martini, Nath, Bartholomew11th EditionFundamentals of Anatomy & PhysiologyISBN: 9780136874089
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Table of contents
- Ch. 1 An Introduction to Anatomy and Physiology26
- Ch. 2 The Chemical Level of Organization34
- Ch. 3 The Cellular Level of Organization30
- Ch. 4 The Tissue Level of Organization24
- Ch. 5 The Integumentary System17
- Ch. 6 Bones and Bone Structure36
- Ch. 7 The Axial Skeleton11
- Ch. 8 The Appendicular Skeleton17
- Ch. 9 Joints13
- Ch. 10 Muscle Tissue12
- Ch. 11 The Muscular System28
- Ch. 12 Nervous Tissue18
- Ch. 13 The Spinal Cord, Spinal Nerves, and Spinal Reflexes22
- Ch. 14 The Brain and Cranial Nerves20
- Ch. 15 Sensory Pathways and the Somatic Nervous System17
- Ch. 16 The Autonomic Nervous System and Higher-Order Functions30
- Ch. 17 The Special Senses16
- Ch. 18 The Endocrine System20
- Ch. 19 Blood31
- Ch. 20 The Heart31
- Ch. 21 Blood Vessels and Circulation29
- Ch. 22 The Lymphatic System and Immunity31
- Ch. 23 The Respiratory System12
- Ch. 24 The Digestive System18
- Ch. 26 The Urinary System31
- Ch. 27 Fluids & Electrolytes32
- Ch. 28 The Reproductive System12
- Ch. 29 Development and Inheritance23
Martini, Nath, Bartholomew11th EditionFundamentals of Anatomy & PhysiologyISBN: 9780136874089Not the one you use?Change textbook
Chapter 11, Problem 30
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 guidance1
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.
Muscles Involved in Suckling
Suckling in newborns primarily involves muscles that control lip closure and cheek tension to create suction. The orbicularis oris muscle encircles the mouth and is essential for sealing the lips, enabling effective suckling. Understanding which muscles contribute to this action helps identify potential issues in feeding.
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Introduction to Muscles and Muscle Tissue Example 1
Function of the Orbicularis Oris Muscle
The orbicularis oris is a complex muscle around the mouth that controls lip movements such as puckering and closing. It plays a critical role in forming a tight seal necessary for suckling and breastfeeding. Dysfunction in this muscle can lead to difficulties in creating suction.
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Role of Buccinator and Other Facial Muscles
The buccinator muscle helps compress the cheeks against the teeth, aiding in manipulating food and maintaining pressure during suckling. Other muscles like the masseter, risorius, and zygomaticus have roles in chewing and facial expression but are less directly involved in suckling mechanics.
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Related Practice
Textbook Question
Why can a pennate muscle generate more tension than can a parallel muscle of the same size?
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Textbook Question
While unloading her car trunk, Amy strains a muscle and as a result has difficulty moving her arm. The doctor in the emergency room tells her that she strained her pectoralis major. Amy tells you that she thought the pectoralis major was a chest muscle and doesn't understand what that has to do with her arm. What should you tell her?
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Textbook Question
Mary sees Jill coming toward her and immediately contracts her frontalis and procerus. She also contracts her right levator labii. Is Mary glad to see Jill? How can you tell?
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