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Extrinsic Back Muscles

Extrinsic Back Muscles – Functional Anatomy

Overview Origin posterior axial skeleton Insertion scapula upper humerus Function retract the scapula depress & elevate the scapula Rotate the scapula upward and downward assists in labored breathing Innervation posterior rami spinal accessory nerve Labored Breathing In labored breathing, extrinsic back muscles stabilize and retract the scapula. This allows the deep extrinsic chest muscles to […]

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Trapezius – Functional Anatomy

Overview Trapezius anatomy is complex. The trapezius is a broad, flat muscle covering the upper back. It is named for the trapezoid shape that these paired muscles create. It has three major sections that originate on the axial skeleton and insert on the pectoral girdle, making it an extrinsic back muscle. Each of its sections

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Rhomboid Major and Minor Muscles – Functional Anatomy

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