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Scapulothoracic Joint
From WikiSM
Origin
Insertion
Actions
- No true bony attachment of the Scapula to the axial skeleton
- Stability is provided by surrounding musculature[1]
- Scapulothoracic muscles (coordinate scapulothoracic motion)
- Scapulohumeral muscles: provide power to the Humerus
- Rotator Cuff (also regulate activities of the Glenohumeral Joint)
- Coracobrachialis
- Deltoid
- Teres Major
- Biomechanics
- Scapula resting position
- Rotated anteriorly 30° relative to trunk
- Tilted forward 20° in sagittal plane
- Range of motion
- Arm elevation: 30° glenohumeral joint, next 60° is combination of scapulothoracic and glenohumeral motion[2]
- Bursa
- Scapulothoracic bursa are neglected entirely or poorly understood in anatomy textbooks
- Infraserratus bursa: between Serratus Anterior and chest wall
- Supraserratus bursa: between Subscapularis and serratus anterior
- Minor bursa inconsistently found at
- Superomedial angle of scapula
- Inferior angle of the scapula
- Trapezoid bursa
- Ligaments
- Transverse scapular ligament
Artery
- Dorsal scapular artery runs deep to rhomboids and levator 1 to 2 cm medial to scapula
Nerve
Clinical Significance
See Also
References
- ↑ Freedman L, Munro RH. Abduction of the arm in scapular plane: scapular and glenohumeral movements. J Bone Joint Surg Am. 1966;18:1503.
- ↑ Bergmann G. Biomechanics and pathomechanics of the shoulder joint with reference to prosthetic joint replacement. In: Kolbel R, Helbig B, Blauth W, editors. , eds. Shoulder Replacement. Berlin: Springer-Verlag; 1987:33-43
