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Latissimus Dorsi Origin
Iliac crest, lumbar fascia, spines of lowest 6 thoracic vertebrae, inferior angle of scapula, lower 3-4 ribs
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Latissimus Dorsi Insertion
Medial to the bicipital groove of the humerus
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Latissimus Dorsi Nerve Supply
Thoracodorsal Nerve - C6, C7, C8, posterior cord of brachial plexus
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Latissimus Dorsi Action
Extends, adducts and medially (internally) rotates arm
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Latissimus Dorsi Blood Supply
Thoracodorsal artery
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Trapezius Origin
External occipital protuberance, superior nuchal line, ligamentum nuchae, spines of C7 and thoracic vertebrae.
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Trapezius Insertion
Lateral clavicle, acromion, and scapular spine.
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Trapezius Nerve Supply
Spinal Accessory Nerve (CN 11)
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Trapezius Action
Raises/Lowers, adducts and rotates scapula
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Trapezius Blood Supply
Transverse Cervical Artery (first part of the subclavian artery)
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Teres Major Origin
Lower lateral border of the scapula
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Teres Major Insertion
Medial to the bicipital groove of the humerus
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Teres Major Nerve Supply
Lower Subscapular Nerve (C5/C6, posterior chord of the brachial plexus)
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Teres Major Action
Adducts, extends and internally rotates arm
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Teres Major Blood Supply
Circumflex Scapular Artery
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Rhomboid Major Origin
T2/T5 spines
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Rhomboid Major Insertion
Medial border of scapula at the infraspinous fossa
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Rhomboid Major Nerve Supply
Dorsal Scapular Nerve (C5/C6 root)
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Rhomboid Major Action
Pulls scapula medial - raises medial border of scapula
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Rhomboid Major Blood Supply
Dorsal Scapular Artery (branch of the subclavian)
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Rhomboid Minor Origin
C7 and T1 spines
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Rhomboid Minor Insertion
Medial border of the scapula, at the spine
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Rhomboid Minor Nerve Supply
Dorsal Scapular Nerve
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Rhomboid Minor Action
Pulls scapula medial/raises medial border
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Rhomboid Minor Blood Supply
Dorsal Scapular Artery (branch of subclavian)
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- 3) Latissimus Dorsi
- 5) Teres Major
- 6) Teres Minor
- 7) Supraspinatus Muscle
- 8) Infraspinatus Muscle
- 13) triceps bracchi muscle
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