Functions of Muscles and Functional Anatomy of Shoulder Region
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Created by:
akadrian777 Plus on March 28, 2012
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8 terms
Terms | Definitions |
|---|---|
 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? | 4:1 |
| During 30-180 degrees abduction what is the ratio of movement between humerus and scapula? | 3:2 |
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