Multiple Choice
Which of the following actions is performed by the external oblique muscle?
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10. Muscles
Muscle Actions
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Which of the following is a primary action of the latissimus dorsi muscle?
A
Flexion of the elbow
B
Abduction of the shoulder
C
Extension of the shoulder
D
Flexion of the hip
Verified step by step guidance1
Identify the location and attachment points of the latissimus dorsi muscle. It originates from the lower spine and iliac crest and inserts into the humerus.
Understand the function of the latissimus dorsi muscle. It is primarily responsible for movements of the shoulder joint.
Consider the types of movements the latissimus dorsi can perform: extension, adduction, and internal rotation of the shoulder.
Evaluate each option: Flexion of the elbow involves the biceps brachii, not the latissimus dorsi. Abduction of the shoulder is primarily performed by the deltoid muscle.
Conclude that the primary action of the latissimus dorsi is the extension of the shoulder, as it pulls the arm back and down towards the body.
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