Question

the shoulder is moved by the ________ muscle.

multiple choice

temporalis

gastrocnemius

sternocleidomastoid

trapezius

biceps brachii

Explanation:

Identify the target action

The question asks which muscle moves the shoulder.

Analyze the options

Using the Trapezius Function knowledge point

• temporalis: A muscle of mastication that elevates and retracts the mandible (jaw).
• gastrocnemius: A major muscle of the calf that plantar flexes the foot and flexes the knee.
• sternocleidomastoid: A neck muscle that flexes and rotates the head.
• trapezius: A large superficial back muscle that elevates, depresses, retracts, and rotates the scapula, thereby moving the shoulder.
• biceps brachii: A muscle of the anterior arm that flexes the elbow and supinates the forearm.

Select the correct muscle

The trapezius is the only muscle listed that acts directly on the shoulder girdle (scapula and clavicle) to move the shoulder.

Answer:

• temporalis
• gastrocnemius
• sternocleidomastoid
• trapezius (Correct answer)
• biceps brachii