Which of the following muscles cannot work in synergy with the other muscles at the shoulder joint?Group of answer choicesBrachialisBiceps brachiiCoracobrachialisUpper pectoralis majorAnterior deltoid
Question
Which of the following muscles cannot work in synergy with the other muscles at the shoulder joint?Group of answer choicesBrachialisBiceps brachiiCoracobrachialisUpper pectoralis majorAnterior deltoid
Solution
The Brachialis muscle cannot work in synergy with the other muscles at the shoulder joint. Here's why:
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The Brachialis muscle is primarily a flexor of the elbow joint, not the shoulder joint. It is located in the upper arm and is responsible for flexing the elbow joint. It does not have any direct anatomical connections to the shoulder joint.
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The other muscles listed - Biceps Brachii, Coracobrachialis, Upper Pectoralis Major, and Anterior Deltoid - all have roles in moving the shoulder joint.
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The Biceps Brachii, while also a flexor of the elbow, has a long head that originates from the scapula, allowing it to assist in shoulder movements.
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The Coracobrachialis, Upper Pectoralis Major, and Anterior Deltoid are all muscles that have primary roles in moving the shoulder joint.
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Therefore, the Brachialis muscle
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