Textbook Question
Muscles that depress the hyoid bone and larynx include all but the:
a. Sternohyoid
b. Omohyoid
c. Geniohyoid
d. Sternothyroid
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Ch. 10 The Muscular System
Hoehn, Haynes, Abbott12th EditionMarieb Human Anatomy & PhysiologyISBN: 9780138242732
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Table of contents
- Ch. 1 The Human Body: An Orientation25
- Ch. 2 Chemistry Comes Alive24
- Ch. 3 Cells: The Living Units24
- Ch. 4 Tissue: The Living Fabric19
- Ch. 5 The Integumentary System12
- Ch. 6 Bones and Skeletal Tissues19
- Ch. 7 The Skeleton14
- Ch. 8 Joints7
- Ch. 9 Muscles and Muscle Tissue26
- Ch. 10 The Muscular System25
- Ch. 11 Fundamentals of the Nervous System and Nervous Tissue23
- Ch. 12 The Central Nervous System25
- Ch. 13 The Peripheral Nervous System and Reflex Activity30
- Ch. 14 The Autonomic Nervous System16
- Ch. 15 The Special Senses26
- Ch. 16 The Endocrine System26
- Ch. 17 Blood27
- Ch. 18 The Cardiovascular System: The Heart25
- Ch. 19 The Cardiovascular System: Blood Vessels27
- Ch. 20 The Lymphatic System and Lymphoid Organs and Tissues16
- Ch. 21 The Immune System: Innate and Adaptive Body Defenses27
- Ch. 22 The Respiratory System21
- Ch. 23 The Digestive System31
- Ch. 24 Nutrition, Metabolism, and Energy Balance26
- Ch. 25 The Urinary System26
- Ch. 26 Fluid, Electrolyte, and Acid-Base Balance24
- Ch. 27 The Reproductive System24
- Ch. 28 Pregnancy and Human Development25
- Ch. 29 Heredity11
Hoehn, Haynes, Abbott12th EditionMarieb Human Anatomy & PhysiologyISBN: 9780138242732Not the one you use?Change textbook
Chapter 10, Problem 6
The chewing muscles that protract the mandible and produce side-to-side grinding movements are the
a. Buccinators
b. Masseters
c. Temporalis
d. Pterygoids
Verified step by step guidance1
Step 1: Understand the function of each muscle listed in the options. The buccinator muscles primarily assist in manipulating food within the mouth but do not protract the mandible or produce grinding movements.
Step 2: Recognize that the masseter muscles are powerful elevators of the mandible, mainly responsible for closing the jaw, not for protraction or side-to-side movements.
Step 3: Know that the temporalis muscles elevate and retract the mandible, meaning they pull the jaw backward rather than forward or side to side.
Step 4: Identify that the pterygoid muscles, specifically the lateral pterygoid, are responsible for protracting the mandible (moving it forward) and producing side-to-side grinding movements during chewing.
Step 5: Conclude that the correct muscles involved in protraction and side-to-side grinding of the mandible are the pterygoids.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Muscles of Mastication
These are the primary muscles responsible for chewing movements, including the masseter, temporalis, medial pterygoid, and lateral pterygoid. Each muscle contributes to specific jaw actions such as elevation, protraction, retraction, and lateral movements.
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Introduction to Muscles and Muscle Tissue Example 1
Mandible Protraction and Grinding Movements
Protraction refers to moving the mandible forward, while side-to-side grinding involves lateral movements essential for chewing. The lateral and medial pterygoid muscles mainly facilitate these actions, enabling efficient breakdown of food.
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Function of the Pterygoid Muscles
The lateral pterygoid muscle protracts the mandible and moves it side to side, while the medial pterygoid assists in elevation and grinding. Together, they coordinate to produce the complex jaw movements needed for mastication.
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Related Practice
Textbook Question
Intrinsic muscles of the back that promote extension of the spine (or head) include all but:
a. Splenius muscles
b. Semispinalis muscles
c. Scalene muscles
d. Erector spinae
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Textbook Question
The prime mover of inspiration is the:
a. Diaphragm
b. Internal intercostals
c. External intercostals
d. Abdominal wall muscles
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Textbook Question
The arm muscle that both flexes and supinates the forearm is the
a. Brachialis
b. Brachioradialis
c. Biceps brachii
d. Triceps brachii
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Textbook Question
Several muscles act to move and/or stabilize the scapula. Which of the following are small rectangular muscles that square the shoulders as they act together to retract the scapula?
a. Levator scapulae
b. Rhomboids
c. Serratus anterior
d. Trapezius
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Textbook Question
Match the muscle names in column B to the facial muscles described in column A.
Column A
______ (1) squints the eyes
______ (2) raises the eyebrows
______ (3) smiling muscle
______ (4) puckers the lips
______ (5) pulls the scalp posteriorly
Column B
a. corrugator supercilii
b. depressor anguli oris
c. frontal belly of epicranius
d. occipital belly of epicranius
e. orbicularis oculi
f. orbicularis oris
g. zygomaticus
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