Trapezius (Upper Fibers)

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Other Names Shoulder (Upper) Upper Traps Heads Upper Fibers (1 of 3) Part I Part II Also see Middle Fibers Lower Fibers Movement Scapula Elevation [1, 2] Spine (Cervical) Extension [1] Neck (Atlantoccipital & Antlantoaxial) Extension [1] Lateral Flexion [1] Rotation [1] Attachments Origin Skull (Posterior Inferior) [ 1] Superior Nuchal Line (Medial Third) Occipital Protuberance (External) Ligamentum Nuchae (Posterior Neck Ligaments) [ 2] Insertion Clavicle Lateral Third (Posterior) [ 1, 2] Related Muscles Levator Scapulae

Comments The biarticulate cranial fibers of the upper trapezius [1 ] enters passive insufficiency through the completion of scapula depression when the neck is flexed, laterally flexed and rotated to the opposite side or through the completion of neck flexion, lateral flexion and rotation when the opposite scapula is depressed. The biarticulate cranial fibers of the upper trapezius [1 ] enters active insufficiency through the completion of scapula elevation when the neck is extended, laterally flexed and rotated to the same side or through the completion of neck hyperextension, laterally flexion and rotation when the scapula is elevated to the same side.