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Synergests of Shoulder Flexion
- Deltoid (anterior fibers)
- Pectoralis Major (upper fibers)
- Biceps Brachii
- Coracobrachialis
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Synergists of Shoulder Extension
- Deltoid (posterior fibers)
- Latissimus Dorsi
- Teres Major
- Pectoralis Major (lower fibers)
- Triceps Brachii (long head)
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Synergists of Shoulder: Horizontal Abduction
Deltoid (posterior fibers)
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Synergists of Shoulder Horizontal Adduction
- Deltoid (anterior fibers)
- Pectoralis Major (upper fibers)
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Synergists of Shoulder Abduction
- Deltoid (all fibers)--mostly middle fibers
- Supraspinatus
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Synergists of Shoulder Adduction
- Latissimus Dorsi
- Teres Major
- Infraspinatus
- Teres Minor
- Pectoralis Major (all fibers)
- Triceps Brachii (long head)
- Coracobrachialis
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Synergists of Shoulder: External (lateral) Rotation
- Deltoid (posterior fibers)
- Infraspinatus
- Teres Minor
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Synergists of Shoulder: Medial Rotation
- Deltoid (anterior fibers)
- Latissimus Dorsi
- Teres Major
- Subscapularis
- Pectoralis Major (all fibers)
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Scapula: Synergists of Elevation
- Trapezius (upper fibers)
- Rhomboid Major
- Rhomboid Minor
- Levator Scapula
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Scapula: Synergists of Depression
- Trapezius (lower fibers)
- Serratus Anterior (with the origin fixed)
- Pectoralis Minor
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What is the Shoulder Joint Called?
Glenohumeral Joint
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What is the joint of the Scapula?
Scapulothoracic Joint (S/T Joint)
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Scapula: Synergists of Adduction (retraction)
- Trapezius (middle fibers)
- Rhomboid Major
- Rhomboid Minor
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Scapula: Synergists of Abduction (protraction)
- Serratus Anterior (with the origin fixed)
- Pectoralis Minor
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Scapula: Synergists of Upward Rotation
- Trapezius (upper & lower fibers)
- Serratus Anterior (with the origin fixed)
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Scapula: Synergists of Downward Rotation
- Rhomboid Major
- Rhomboid Minor
- Levator Scapula
- Pectoralis Minor
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What is the ACTION of the DELTOID
-all fibers, anterior fibers, & posterior fibers
- All Fibers: Abduct the shoulder
- Anterior Fibers: Flex, medially rotate, & horizontally adducts the shoulder
- Poserior Fibers: extend, laterally rotate & horzontally abduct the shoulder
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Deltoid (OIN)
- Origin: Lateral 1/3 of clavicle, acromion & spine of scapula
- Insertion: Deltoid Tuberosity
- Nerve: Axillary C5,6
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What is the ACTION of the TRAPEZIUS?
-bilaterally
-unilaterally
-middle fibers
-lower fibers
- Bilaterally: Extends the head & neck
- Unilatterally: laterally flexes & rotates the head & neck, elevates & upwardly rotates the scapula
- Middle Fibers: Adducts & stabilizes the scapula
- Lower Fibers: Depresses & upwardly rotates the scapula
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Action of the Middle Fibers of the Trapezius
Adducts & Stabilizes the Scapula
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Trapezius (OIN)
- Origin: External Occipital Protuberance, medial portion of Superior Nuchal Line of Occiput, Ligamentum Nuchae & C-7 to T-12
- Insertion: Lateral 1/3 of clavicle, acromion & spine of scapula
- Nerve: Spinal portion of Cranial Nerve XI (accessory) & Ventral Ramus C2,3,4
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