Anatomy by Planes
Complex Joints Motions
Sagittal plane.
Sagittal shoulder girdle, S13.
Acromioclavicular joint.
Sternoclavicular joint.
Scapulothoracic "joint."
10 - 15 degrees anterior tilt.
20 - 25 degrees posterior tilt.
Indirect Motion Reciprocal Relationships
C3 - T9.
None.
Sagittal rib cage, S12.
Sagittal shoulder girdle, S13. ←
Sagittal shoulder, S14.
Muscles Single-Complex Depth of Muscle
Posterior tilt.
Rhomboids (major and minor).
Shoulder girdle. ←
Level 2 (deep to skin and one layer of muscle).
Single-Complex Antagonists (0) Multi-Complex Synergists (2) Multi-Complex Antagonists (1)
None.
None.
Serratus anterior.
Trapezius (lower part, mostly).
Pectoralis minor.
Traditional Anatomy
Proximal attachments
The rhomboids (major and minor) connect with the spines of the seventh cervical through fifth thoracic vertebrae, the lower part of the ligamentum nuchae, and the supraspinous ligaments of the second through fifth thoracic vertebrae.
Distal attachment
The muscles connect with the medial border of the scapula from its spine to just above its inferior angle.
Location
The muscles cover the upper five to six ribs between the spines of the upper thoracic vertebrae and the medial edge of the scapula. It's located deep to the trapezius.
Innervation
By a branch from the dorsal scapular nerve.
Vascular Supply
By the dorsal scapular artery or a branch of the transverse cervical artery, and by dorsal perforating branches from the first five or six posterior intercostal arteries.
Motion
Elevation shoulder girdle.
Retraction shoulder girdle.
