#Trapezius muscle .

#Origin:-

Medial third of superior nuchal line , external occipital protubrance , ligament nuchae , 7 th cervical spine and all the thoracic spines.

#Insertion:-

Lateral third of clavicle , acromion process and spine of scapula.

#Nerve supply:-

Spinal accessory nerve (motor) and C 3 , 4 (proprioceptive).

#Action:-

Both muscle external the neck.

Upper fibers Of one side lateral flex the neck.

Upper fibers #elevate the shoulder.

Middle fibers #retract the shoulde.

Lower fibers #depress the shoulder.







#Butheina...🌸✨
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https://t.me/DentalKD