Term
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Definition
Origin - iliac crest, lumbar fascia, spines of 7-12 thoracic vertebrae inferior angle of scapula, and 3-4 lower ribs
Inserstion - medial to the bicipital groove of humerus
Action - extends, adducts and medially (internally) rotates arm
Nerve supply - thoracodorsal nerve (C6, C7, C8 - posterior cord of brachial plexus)
Blood supply - thoracodorsal artery (cont. of subscapular artery) |
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Term
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Definition
Origin - external occipital protuberance, superior nuchal line, ligamentum nuchae, spines of C7 and thoracic vertebrae
Insertion - lateral clavicle, acromion, and scapular spine
Nerve supply - spinal accessory nerve (CN XI)
Action - raises, lowers, adducts, and rotates scapula
Blood supply - transverse cervical artery (branch of thyrocervical trunk which is the 1st portion of the subclavian artery) |
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Term
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Definition
Origin - lower segment of lateral border of scapula
Insertion - medial to bicipital groove of humerus
Nerve supply - lower subscapular nerve (C5, C6 - posterior cord of brachial plexus)
Action - adducts, extends and medially (internally) rotates arm
Blood supply - circumflex scapular artery (of subscapular artery) |
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Term
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Definition
Origin - spines of C7 and T1 vertebrae
Insertion - medial border of scapula at spine
Nerve supply - dorsal scapular nerve (C5 - C5 root)
Action - pulls scapula medially and raises medial border of scapula
Blood supply - dorsal scapular artery (branch of subclavian artery) |
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Term
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Definition
Origin - spines of 2-5 thoracic vertebrae
Insertion - medial border of scapula at infraspinous fossa
Nerve supply - dorsal scapular nerve (C5-C5 root)
Action - pulls scapula medially and raises medial border of scapula
Blood supply - dorsal scapular artery (branch of subclavian artery) |
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Term
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Definition
Origin - transverse processes of C1-C4 vertebrae
Insertion - superomedial border of scapula
Nerve supply - dorsal scapular nerve (C5-C5 root)
Action - raises scapula at medial border
Blood supply - dorsal scapular artery (branch of subclavian artery) |
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Term
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Definition
Origin - ribs 1-8
Insertion - inferior angle and medial border of scapula
Nerve supply - long thoracic nerve (C5, C6, C7 - C5-C7 roots)
Action - rotates scapula and pulls scapula around thoracic cage
Blood supply - lateral thoracic artery (of axillar artery - 2nd part) |
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Term
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Definition
Damage to long thoracic nerve
(Nerve intervates serratus anterior muscle) |
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Term
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Definition
Boundaries: medial - trapezius
Inferior - latissimus dorsi
Lateral - medial border of scapula and rhomboid major
Significance: Hear sounds of respiration |
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Term
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Definition
Boundaries: Medial - latissimus dorsi
Lateral - external oblique
Inferior - iliac crest
Importance: lumbar hernia |
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Term
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Definition
Boundaries: Superior - teres minor muscle
Lateral - proximal shaft humerus
Inferior - teres major muscle
Medial - long head of triceps brachii muscle
Structures: axillary nerve, posterior circumflex humeral artery |
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Term
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Definition
Boundaries: Superior - teres minor muscle
Inferior - teres major muscle
Lateral - long head of triceps brachii muscle
Structures: circumflex scapular artery (of subscapular artery) |
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Term
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Definition
Boundaries: Superior - teres major muscle
Lateral - lateral head of triceps brachii muscle
Medial - long head of triceps brachii muscle
Structures: deep artery of arm (profunda brachii artery of brachial artery), radial nerve (C5, C6, C7, C8, T1 - posterior cord of brachial plexus) |
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