Download Trapezius

Kinesiology of the Shoulder Girdle
Bones of the Shoulder Girdle
• Scapula
• Clavicle
Scapula
• Anterior view (fig. 4.1)
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Inferior angle
Lateral border
Medial border
Subscapular fossa
Glenoid fossa
Coracoid process
Acromion process
Superior acromioclavicular lig.
Coracoclavicular ligament
• (trapezoid and conoid)
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Superior angle
Sternoclavicular ligament
Interclavicular ligament
Manubrium and stermum
• Scapula: posterior view (fig. 4.2)
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Inferior angle
Medial border
Lateral border
Spine of scapula
Glenoid fossa
Acromion process
Superior angle
Supraspinous fossa (supraspinatus fossa)
Infraspinous fossa (infraspinatus fossa)
Movements of Shoulder Girdle:
Scapulohumeral Rhythm
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Elevation
Depression
Retraction (scapular adduction)
Protraction (scapular abduction)
Upward rotation
Downward rotation
Trapezius
• Origin (Upper) base of skull, EOP, neck
ligaments
• Origin (Middle) SP C7-T3
• Origin (Lower) SP T4-T12
• Insertion (U) lat. 1/3 clavicle
• Insertion (M) Acromion, upper spine of
scapula
• Insertion (L) medial spine of scapula
Trapezius
• Action (U) elevation of scapula, cervical
extension
• Action (L) depression, adduction, and
upward rotation of scapula
• Action (M) elevation, upward rotation, and
adduction of scapula
• N: Spinal accessory nerve
Levator Scapulae
• O: TP C1-C4
• I: Med. Border of scapula above spine
(superior angle)
• A: elevation of scapula (duhhhh,,,)
• N:Dorsal scapular n.
Rhomboids
• Origin: SP C7 - T 5
• Insertion: Medial border scapula below
spine.
• Action: Adduction, elevation,
downward rotation of scapula
• N: Dorsal scapula n.
Serratus Anterior
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O: Ribs 1-9
I: Ant. Surface, medial border scapula
A: Abduction, upward rotation, scapula
N. Long thoracic n.
Pectoralis Minor
• O: Ribs 3-5
• I:Coracoid process
• A: Depression, Abduction, Downward
Rotation of Scapula.
• N: Medial pectoral n.
Subclavius
• O: Rib 1
• I: Mid clavicle
• A: Stabilization of S/C joint, depression of
shoulder girdle.
• N: nerve fibers from C5 and C6
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Shoulder movements with
accommodating shoulder girdle
(scapula) movements
Abduction
Adduction
Flexion
Extension
Int. rot.
Ext. rot.
Horiz. Add.
Horiz. Abd.
upward rotation
downward rot.
elevation/up rot.
depression/down rot.
Protraction
Retraction
Protraction
Retraction