Term
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Definition
Origin - iliac crest, lumbar fascia, spines of lower 6 thoracic vertebrae, inferior angle of scapula, and 3-4 lower ribs.
Insertion - medial to bicipital groove of humerus.
Nerve supply - thoracodorsal nerve (C6, C7, C8 - posterior cord of brachial plexus).
Action - extends, adducts and medially (internally) rotates arm
Blood supply - thoracodorsal artery (continuation 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 |
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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 |
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Term
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Definition
5 Spinal roots C5, C6, C7, C8. T1
3 Trunks with 3 anterior and 3 posterior divisions |
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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 - 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 - transverse processes of C1-4 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 - C5-7 roots).
Action - rotates scapula and pulls scapula around thoracic cage.
Blood supply - lateral thoracic artery (of axillary artery - 2nd part) |
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Term
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Definition
Boundaries
medial - trapezius muscle
inferior - latissimus dorsi muscle
lateral - medial border of scapula and rhomboid major muscle (floor)
Significance
hear sounds of
respiration |
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Term
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Definition
Boundaries
Latissimus dorsi muscle - medial
External oblique muscle - lateral
Iliac crest - inferior
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 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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