Define trapezius m.
Superior: attach on the medial part of the skull and spinous processes of cervical vertebrae (via the nucal ligament) to the lateral third of the clavicle and the acromion of the scapula. Movement: extend the skull and elevate the scapula and superior rotation
Middle: attach at spinous processes of inferior ceviacl and superior thoracici vertebra to the spione of the scapula. Movement: retract scapula
Inferior: attach at spinous processes of inferior cervical and superior thoracic vertebra to the medial part of the spine of teh scapula. Movement: depress scapula and act in superior rotation
- Motor supply to the trap is: spinal accessory n. (CN XI)
- Sensory supply: anterior rami of C3 and C4