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trapezius muscle origin
external occipital protuberance, medial 3rd of superior nuchal line, nuchal ligament, spinous processes of C7 - T12 vertebrae
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trapezius muscle insertion
lateral 3rd of clavicle, acromion, and spine of scapula
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trapezius muscle innervation
spinal accessory nerve (motor)
C3 & C4 (pain and proprioception)
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trapezius muscle action
elevate, retract and rotate scapula
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trapezius muscle blood supply
thoracic neurovascular bundles, and transverse cervical a, v.
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Rhomboid (Major and Minor) Origin
1. Minor = nuchal ligament and spinous processes of C7 -T1 vertebrae
2. Major = spinous processes of T2 - T5 vertebrae
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Rhomboid (Major and Minor) Insertion
1. Minor = triangular area at medial end of scapular spine
2. Major = medial border of scapula at level of spine to inferior angle of scapula
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Rhomboid (Major and Minor) Innervation
(C4, C5) Dorsal Scapular Nerves
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Rhomboid (Major and Minor) Action
fix scapula against thoracic wall
rotate scapula to depress glenoid cavity of scapula
retract scapula
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Rhomboid (Major and Minor) Blood Supply
tributaries and branches from scapular anastamose; cervical neurovascular bundles
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Levator Scapulae Origin
posterior tubercles of transverse processes C1 - C4 vertebrae
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Levator Scapulae Insertion
medial border of scapula superior to root of scapular spine
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Levator Scapulae Innervation
Dorsal Scapular (C5) and C3 & C4
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Levator Scapulae Action
elevate scapula; tilt its glenoid cavity inferiorly by rotating scapula
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Levator Scapulae Blood Supply
thyrocervical trunk
jugular v.
suprascapular a, v.
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Latissimus Dorsi Origin
spinous processes of inferior 6 thoracic vertebrae
thoracolumbar fascia
iliac crest
inferior 3 or 4 ribs
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latissimus dorsi insertion
floor of the intertubercular groove (sulcus) of the humerus
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latissimus dorsi innervation
thoracodorsal n. (C6, C7, C8)
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latissimus dorsi action
extend, adduct, and medially rotate humerus
raise body towards arms while climbing
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latissimus dorsi blood supply
thoracodorsal a, v.
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Teres Major Origin
posterior surface of inferior angle of scapula
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Teres Major Insertion
medial lip of intertubercular sulcus of the humerus
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Teres Major Innervation
(C5, C6) lower subscapular nerves
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Teres Major Action
adduct and medially rotate the arm
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Teres Major blood supply
scapular anastamose
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Teres Minor Origin
middle part of lateral border of scapula
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Teres Minor Insertion
inferior facet of greater tubercle of humerus
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teres minor innervation
axillary n. (C5 & C6)
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teres minor action
laterally rotate the arm
helps hold the humeral head in the glenoid cavity of the scapula
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teres minor blood supply
scapular anastamose
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