Term
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Definition
ORIGIN:
Upper- Occupit, Ligamentum nuchae, C7 vertebra (spinous process)
Middle- T1-T5 vertebrae (spinous processes), supraspinous ligaments
Lower- T6-T12 vertebrae (spinous processes), supraspinous ligaments
INSERTION:
Upper- Clavicle (posterior surface, lateral 1/3)
Middle- Scapula (middle margin of acromion); spine of scapula and crest of its superior lip
Lower- Scapula (spine: tubercle at lateral apex and aponeurosis at root of spine)
FUNCTION:
All- Stabilizes scapula during movements of the arm.
Upper and Lower- Rotation of the scapula so glenoid faces up
Upper- Elevation of scapula, shrugging; rotation of head to opposite side; capital and cervical extension
Middle - Scapular adduction (retraction)
Lower- Scapular adduction, depression, and upward rotation
INNERVATION:
Accessory (XI) nerve |
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Term
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Definition
ORIGIN: T2-T5 vertebrae, supraspinous ligaments
INSERTION: Scapula (medial border)
FUNCTION: Scapular adduction; downward rotation of scapula; scapular elevation
INNERVATION: C5 dorsal scapular nerve |
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Term
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Definition
ORIGIN: C7-T1 vertebrae, ligamentum nuchae (lower)
INSERTION: Scapula (root of spine and on medial border)
FUNCTION: Scapular adduction; scapular downward rotation; scapular elevation
INNERVATION: C5 dorsal scapular nerve |
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Term
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Definition
ORIGIN: C1-C4 vertebrae (transverse processes and posterior tubercles)
INSERTION: Scapula (vertebral border b/c superior angle and root of spine)
FUNCTION: Elevates and adducts scapula; scapular downward rotation; lateral bending of cervical spine to same side; cervical rotation and extension
INNERVATION: C3-C4 spinal nerves, C5 dorsal scapular nerve |
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Term
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Definition
ORIGIN: Ribs 1-8; aponeurosis of intercostal muscles
INSERTION: Scapula (ventral surface of whole vertebral border)
First digitation- Superior angle of scapula on anterior aspect
Second and third digitations- Anterior (costal) surface of whole vertebral border
Fourth to eighth digitations- Inferior angle of scapula (costal surface)
FUNCTION: Scapular ABduction; upward rotation of the scapula; prevents "winging"
INNERVATION: C5-C7 long thoracic nerve |
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