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Deltoid: Attachments
- Lateral 1/3 of clavicle
- Acromion
- Spine of scapula
Deltoid tuberosity of humerus
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Deltoid: Innervation & Bloody Supply
Axillary N. ( C5, C6)
- Posterior Circumflex Humeral A.
- Deltoid branch of Thoracoacromial A.
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Deltoid: Actions
- Clavicular - Flexes / Medial Rotation
- Middle - Abducts
- Spinal - Extends / Laterally Rotation
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Supraspinatus: Attachments
Supraspinous fossa of scapula
Greater tubercle of humerus
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Supraspinatus: Innervation & Blood Supply
Suprascapular N. (C5, C6)
Suprascapular A.
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Supraspinatus: Actions
Initiates abduction of upper limb (15 degrees)
Holds head of humerus in the glenoid cavity during arm elevation (flexion, abduction)
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Infraspinatus: Attachments
Infraspinous fossa of scapula
Middle facet on greater tubercle of humerus
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Infraspinatus: Innervation & Blood Supply
Suprascapular N. ( C5, C6)
- Suprascapular A.
- Scapular Circumflex A.
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Infraspinatus: Actions
Laterally rotates humerus
Holds head of humerus in glenoid fossa during arm movements
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Teres Minor: Attachments
Middle (superior) part of lateral border of scapula
Inferior facet on greater tubercle of humerus
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Teres Minor: Innervation & Blood Supply
Axillary N. (C5, C6)
Circumflex Scapular A.
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Teres Minor: Actions
Laterally rotates humerus
(Weak adductor of humerus)
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Subscapularis: Attachments
Subscapular fossa
Lesser tubercle of humerus
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Subscapularis: Innervation & Blood Supply
Upper and lower Subscapular Nerves (C5, C6, C7)
- Subscapular A.(Lateral Thoracic A.)
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Subscapularis: Actions
Medially rotates humerus
(weak adductor)
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Teres Major: Attachments
Posterior surface of inferior angle of scapula
Medial lip of intertubercular groove of humerus
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Teres Major: Innervation & Blood Supply
Lower Subscapular N. (C5, C6, C7)
Circumflex Scapular A.
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Teres Major: Actions
Adducts / Medially Rotates Humerus
(Extends arm)
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