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Scapula
From WikiSM
Description
Attachments
- Anterior
- Subscapularis (subscapular fossa)
- Pectoralis Minor (coracoid process)
- Coracobrachialis (coracoid process)
- Medial
- Serratus Anterior (medial border)
- Rhomboid Major (medial border)
- Rhomboid Minor (medial border)
- Levator Scapulae (medial border)
- Posterior
- Trapezius (spine of scapula)
- Deltoid (spine of scapula)
- Supraspinatus (supraspinatus fossa)
- Infraspinatus (infraspinatus fossa)
- Lateral
- Triceps Brachii (long head: infraglenoid tubercle)
- Biceps Brachii (short head: coracoid process, long head: supraglenoid tubercle)
- Teres Minor (lateral border)
- Teres Major (lateral border)
- Inferior
- Latissimus Dorsi (inferior border)
Actions
- Role of scapula[1]
- Provides synchronous scapular rotation during humeral motion
- Serves as a stable base for Rotator Cuff activation
- Functions as a link in the kinetic chain
- Planes of motion[2]
- Upward/downward rotation around a horizontal axis perpendicular to the plane of the scapula
- Internal/external rotation around a vertical axis through the plane of the scapula
- Anterior/posterior tilt around a horizontal axis in the plane of the scapula
- Planes of translation
- Upward/downward translation on the thoracic wall
- Retraction (posterior, medial)/protraction (anterior, lateral) around the rounded thorax
- Action by muscle group
- Elevation: upper Trapezius, Levator Scapulae
- Depression: lower Trapezius
- Retraction (adduction): Rhomboid Major, Rhomboid Minor, middle Trapezius
- Protraction (abduction): Serratus Anterior
- Upward rotation: upper, middle Trapezius
- Downward rotation: Rhomboid Major, Rhomboid Minor
Clinical Significance
See Also
References
- ↑ Kibler, W. Ben, and Aaron Sciascia. "Current concepts: scapular dyskinesis." British journal of sports medicine 44.5 (2010): 300-305.
- ↑ McClure PM, Michener LA, Sennett BJ, et al. Direct 3-dimensional measurement of scapular kinematics during dynamic movements in vivo. J Shoulder Elbow Surg 2001;10:269–77