Term
Scapulohumeral Rhythm
What works together as a kinetic chain to produce movement of the arm? |
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Definition
| Scapula, Humerus, and Clavicle |
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Term
Definition: Scapulohumeral Rhythm
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Definition
The 2:1 ratio of glenohumeral to scapulothoraacic motion
<30* abduction/flexion: movement occurs almost entirely at the glenohumeral joint alone
>30*abduction/flexion: For every 2* of glenohumeral motion, the scapula upwardly rotates 1*
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Term
| Purpose of Scapulohumeral Rhythm |
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Definition
| prevents impengement between the humerus and the acromion |
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Term
Two or more muscles
pulling in different directions
with equal force to create the same motion
about the same axis |
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Definition
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Term
Force couples of the Shoulder Girdle
Upward rotation of the Scapula |
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Definition
Upper Tapezius pull upward
Lower Trapezius pull downward
Serratus Anterior pulls outward in a horizontal direction |
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Term
Force couple ~Humeral Elevation
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Definition
| Deltoid and rotator cuff muscles work together to create elevation at the GH Jt. |
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Term
Force couples of the Shoulder Girdle
Downward rotation of the Scapula |
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Definition
Pectoralis Minor pulls downward
Rhomboids pull inward
Levator Scapula pulls upward |
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