Mm attachment, nerve innervations, Mm function
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| Motility | Not usually involved in weight bearing.Spontaneous,often unconscious
movement
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| Mobility | Its stability is sacrificed to gain. Independent,purposeful movement
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| Quadrangular space | Axillary nerve, Posterior humeral
circumflex artery
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| Triangular interval | Radial nerve, Deep brachial artery
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| Greater tubercle humeral avulsion fractures | involves subscapularis, infraspinatus, supraspinatus
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| Humeral surgical neck fractures | axillary nerve damage
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| Posterior humeral head dislocations | UCL often torn, ulnar nerve injury, numbness of the little fingers and weakness of flexion and adduction of wrist
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| Deltoid | flexes,abducts,extends,laterally, and medially rotates arm.
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| Teres major | Adducts,medially rotates and extends arm
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| Supraspinatus | Helps deltoid to abduct arm and acts with rotator cuff muscles
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| Infraspinatus | Laterally rotate arm; Help to hold humeral head in glenoid cavity of scapula
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| Teres minor | Laterally rotate arm; Help to hold humeral head in glenoid cavity of scapula
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| Subscapularis | Medially rotates arm & adducts it; helps to hold humeral head in glenoid cavity
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| What nerve innervates teres minor? | axillary nerve (C5, C6)
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| What nerve innervates deltoid? | axillary nerve (C5, C6)
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| What nerve innervates teres major? | lower subscapular nerve (C5, C6)
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| What nerve innervates supraspinatus? | suprascapular nerve (C5, C6)
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| What nerve innervates infraspinatus? | suprascapular nerve (C5, C6)
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| What nerve innervates subscapularis? | upper and lower subscapular nerves (C5-C7)
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| What are the attachments of the Subscapularis? | -Subscapular fossa
-Lesser tubercle of humerus & joint capsule
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| What are the attachments of the Teres minor? | -Superior part of lateral border of scapula
-Inferior facet on greater tubercle of humerus & joint capsule
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| What are the attachments of the Infraspinatus? | -Medial 2/3 of intraspinous fossa of scapula
-Middle facet on greater tubercle of humerus & joint capsule
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| What are the attachments of the Supraspinatus? | -Medial 2/3 of supraspinous fossa of scapula
-Superior facet on greater tubercle of humerus & joint capsule
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| What are the attachments of the Teres major? | -Dorsal surface of inferior angle of scapula
-Medial lip of intertubular groove of humerus
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| What are the attachments of the Deltoid? | -Lateral third of clavicle (anterior superior border, acromion (superior lateral surface), spine of scapula (posterior border, inferior edge)
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| Primary impingement | Shape of acromion and clearance under coracoacromial arch, Thickness of supraspinatus and biceps brachii tendon, Repetitive overhead movement, Overstretching
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| Secondary impingement | functional instability, flexibility of tendons and ligaments, muscle strength endurance, control
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