TRAPEZIUS

Origin

Med third sup nuchal line, lig nuchae, spinous processes and supraspinous ligs to T12

Action

Lat rotates, elevates and retracts scapula. If scapula is fixed , extends and lat flexes neck

Insertion

Upper fibres to lat third of post border of clavicle; lower to med acromion and sup lip of spine of scapula to deltoid tubercle

Nerve

Spinal accessory N (lat roots, C1-5)(spinal nerves C3 and C4 for proprioception)