The trapezius muscle can function as both a fixator and a synergist, depending on the movement being performed. As a fixator, it stabilizes the scapula during arm movements, allowing other muscles to work efficiently. As a synergist, it assists in shoulder elevation and retraction, working alongside other muscles like the deltoids and rhomboids. Its versatile role makes it essential for various upper body movements.
synergists: trapezius, teres major and minor, flexors, biceps brachiiantagonists: deltoid, extensors, triceps brachii
its either agonists, antagonists, synergists, or a fixator. i know this may not help if you are doing the worksheet from Dr. Adcocks lab but hopefully these narrow it down to four for some people (-:
Synergists help steady movements and fixators help stablize the prime movers origin.
Take a complex action like riding a bike: your qaudriceps and calf muscles are the agonists (contracting muscles). The antagonists are the muscles of your hamstring and shins. other leg muscles act as synergists and muscles of your back and abdomen act as fixators to stop you falling off.
The prime mover is a conceptual term from Aristotle's philosophy to describe an unmoved mover that initiates all motion in the universe. Therefore, nothing performs the same movement as the prime mover since it is considered the ultimate cause of all motion.
Retraction= Middle trapezius Elevation= Upper trapezius
fixator
trapezius
The latissimus dorsi and pectorals major are synergists for shoulder adduction
The trapezius muscle in humans is a single, large muscle divided into three specific regions based on their functions: the upper trapezius, middle trapezius, and lower trapezius. Each region of the trapezius muscle contributes to different movements of the shoulder and neck.
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Assisting muscles are called synergists. They help the prime mover muscle by stabilizing the movement or helping with specific aspects of the motion.