What is the prime function of muscles?
To produce movement, through the concentric contraction of a muscle.
What is the difference between an agonist and antagonist?
-Agonist= prime/assistant concentric mover
-Antagonist= opposing eccentric mover
How do the RC muscles function as stabilisers and synergists?
In abduction of shoulder, both posterior and anterior rotator cuff must act as synergists to stop the shoulder from leaning anteriorly or posteriorly and stabilise joint by taking up slack i shoulder, acting as proprioceptors and provide medial force to keep humeral head in place.
What muscles are activated in lateral rotation of the scapula?
Serratus Anterior: pulls medial or vertebral border of scapula medially
Upper Trapezius: Pulls acromion and clavicle superiorly
Middle Trapezius: Acts as synergist
Lower Trapezius: Pulls spine of Scapula inferiorly
How does the curved crank like shape of the clavicle increase shoulder mobility?
A little bit of backwards rotation at SC joint equals a lot of movement at AC end.
What is scapulohumeral rhythm?
Co-ordination between humeral and scapular movements
During 0-30 degress abduction what is the ratio of movement between humerus and scapula?
During 30-180 degrees abduction what is the ratio of movement between humerus and scapula?