PT 505 Lecture Notes - Lecture 10: Rhomboid Muscles, Kinematics, Acromion
9 Nov 2020
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How do lower trapezius, serratus anterior, and upper. A force couple is a type of synergist that produces pure rotation. The lower tap, upper trap, and serratus act as a force couple to produce upward rotation while inhibiting elevation/depression and protraction. The middle trap originates on spinous processes t1-t4, and inserts on the acromion of the scapula. Based on the transverse fiber direction, it works to bring the scapula closer together towards the midline thus producing only retraction. One action that would maximally activate all three parts of the trapezius would be winding up to pitch a baseball. This motion includes elevation, upward rotation, and retraction of the scapula. And describe the synergy between the rhomboids and lower trapezius. (refer to fig. Synergist is two or more muscles working together to produce desired movements while inhibiting unwanted movements. The rhomboids work to move the scapula into downward rotation while the lower trap works to move the scapula into upward rotation.
