process, spine of scapula
Insertion
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? Middle of lateral surface of shaftof humerus
Nerve supply
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? Axillary nerve C5, 6Action
Middle fibers Abducts arm;
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anterior fibers flex and medially
rotate arm;
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posterior fibers extend and laterallyrotate arm
? Abduction from 15-90 degrees
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Structures under cover of Deltoid
BONE- Upper part humerus, coracoid process
,greater tubercle, lesser tubercle Intertuberculus
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sulcus
Bursa- Subdeltoid , subaccromial bursa
Muscles ? attached around shoulder joint
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vessel- Ant and Post circumflex humeral vesselNerves- Axillary
Supraspinatus
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Origin
? medial 2/3 of Supraspinous
fossa of scapula
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Insertion
? Greater tuberosity of humerus;
capsule of shoulder joint
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Nerve supply
? Suprascapular nerve C 5, 6
Action
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? Abducts arm and stabilizesshoulder joint
? Initiation of abduction 0-15
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degrees
Infraspinatus
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Origin
? Medial 2/3 Infraspinous fossa
of scapula
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Insertion
? Greater tuberosity of
humerus; capsule of shoulder
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joint
Nerve supply
? Suprascapular nerve C 5, 6
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Action
? Laterally rotates arm and
stabilizes shoulder joint
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Teres minor
Origin
? Upper two thirds of
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lateral border of scapula
Insertion
? Greater tuberosity of
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humerus; capsule of
shoulder joint
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Nerve supply? Axillary nerve C5, 6
Action
? Laterally rotates arm and
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stabilizes shoulder jointTeres major
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Origin? Lower third of lateral
border of scapula
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Insertion? Medial lip of bicipital
groove of humerus
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Nerve supply? Lower subscapular nerve
C6, 7
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Action? Medially rotates and
adducts arm and
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stabilizes shoulder jointSubscapularis
Origin
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? Medial 2/3 subscapularfossa
Insertion
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? Lesser tubercle of humerusNerve supply
? Upper and lower
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subscapular nerves C5, 6, 7Action
? Medially rotates arm and
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stabilizes shoulder jointRotator Cuff
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Arterial Anastomosis Around theShoulder Joint
? The extreme mobility of the
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shoulder joint may result in
kinking of the axillary artery and
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a temporary occlusion of itslumen
? To compensate for this, an
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important arterial anastomosis
exists between the branches of
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the subclavian artery and theaxillary artery
? ensuring that an adequate blood
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flow takes place into the upper
limb irrespective of the position
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of the arm