Trapezius and Levator Scapulae
The trapezius muscle extends from the upper back to the back of the neck. Its main functions are to support the arm and to move the shoulder blade.
synergists: trapezius, teres major and minor, flexors, biceps brachiiantagonists: deltoid, extensors, triceps brachii
Rhomboids Major and Minor are the primary muscles that Adduct the Scapula.
The prime mover of flexion of the head is the sternocleidomastoid muscle. It acts to tilt and rotate the head to the opposite side when contracted unilaterally and both muscles together flex the neck and bring the head towards the chest.
The antagonists to the pectorals are the muscles in the upper back, specifically the rhomboids and trapezius. These muscles work in opposition to the pectorals to allow for controlled movement and to prevent injury.
The Prime Mover was created on 1961-03-24.
A prime mover is a machine which transforms energy to/from thermal or electrical, or pressure from/to mechanical form. Examples of a prime mover are engines or turbines.
The masseter is the prime mover of the jaw closure.
Pronator quadratus is the prime mover in pronation of the hand.
A prime mover is the muscle that has the most influence in one direction on the joint it acts on. For example the prime mover in extension of the forearm is the triceps.
The prime muscle differs depending on the degree of abduction. From 1 to 20 degrees it is the supraspinatus muscle, from 20 to 90 degrees it is the deltoid and from 90 degree and above the action is done by that rotate the scapula (trapezius and serratus anterior).