Which of the following muscles is NOT a rotator cuff muscle?
Supraspinatus
Infraspinatus
Rhomboid minor
Teres minor
Subscapularis
The Correct Answer is C
Choice A reason: Supraspinatus is one of the four rotator cuff muscles. It originates from the supraspinous fossa of the scapula and inserts on the greater tubercle of the humerus, aiding in shoulder abduction and stabilization.
Choice B reason: Infraspinatus is a rotator cuff muscle that originates from the infraspinous fossa of the scapula and inserts on the greater tubercle of the humerus. It functions in external rotation of the shoulder.
Choice C reason: Rhomboid minor is not part of the rotator cuff. It is located in the upper back and functions to retract the scapula. It does not attach to the humerus or contribute to shoulder joint stabilization.
Choice D reason: Teres minor is a rotator cuff muscle that originates from the lateral border of the scapula and inserts on the greater tubercle of the humerus. It assists in external rotation and stabilization of the shoulder.
Choice E reason: Subscapularis is the fourth rotator cuff muscle. It originates from the subscapular fossa and inserts on the lesser tubercle of the humerus, functioning in internal rotation of the shoulder.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A reason: Protraction and retraction refer to the forward and backward movement of the mandible, which occurs during certain chewing motions but is not the primary movement involved in chewing.
Choice B reason: Opposition and reposition are movements of the thumb and fingers, not the mandible. They are unrelated to chewing.
Choice C reason: Pronation is a rotational movement of the forearm, not the mandible. Elevation is correct, but pronation does not apply to jaw movement.
Choice D reason: Elevation and depression are the correct movements involved in chewing. Elevation closes the jaw (biting), and depression opens it (jaw lowering).
Choice E reason: Supination is also a forearm movement and does not apply to the mandible. Depression is correct, but supination is irrelevant here.
Correct Answer is C
Explanation
Choice A reason: Pronation refers to the rotation of the forearm so that the palm faces downward. It does not describe movement away from the midline.
Choice B reason: Protraction refers to the anterior movement of a body part, such as pushing the shoulders forward. It does not involve lateral movement of the arm.
Choice C reason: This is correct. Abduction is the movement of a limb away from the midline of the body. Raising the arm sideways away from the torso is a classic example of abduction.
Choice D reason: Adduction is the opposite of abduction. It involves moving a limb toward the midline of the body.
Choice E reason: Retraction refers to the posterior movement of a body part, such as pulling the shoulders backward. It does not describe lateral arm movement.
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