Multiple Choice
Which of the following is an action of the external abdominal oblique muscle?
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10. Muscles
Muscle Actions
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In facial expression, which muscle primarily raises the corner of the mouth during smiling?
A
Zygomaticus major
B
Depressor anguli oris
C
Orbicularis oris
D
Buccinator
Verified step by step guidance1
Step 1: Understand the function of each muscle listed in the options related to facial expressions.
Step 2: Recall that the Zygomaticus major muscle is responsible for elevating the corners of the mouth, which is the primary action during smiling.
Step 3: Recognize that the Depressor anguli oris muscle pulls the corners of the mouth downward, which is opposite to smiling.
Step 4: Know that the Orbicularis oris muscle controls movements of the lips, such as puckering, but does not raise the mouth corners.
Step 5: Understand that the Buccinator muscle primarily compresses the cheeks and assists in chewing, not in raising the mouth corners.
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