This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Upper limb, Subject name: Anatomy
Nerve supply of Trapezius 
Select and explain. 
A. Spinal accessory nerve, B. Hypoglossal nerve, C. Trochlear nerve, D. Trigeminal nerve
A: Spinal accessory nerve
Answer: A: Spinal accessory nerve 
Explanation: TRAPEZIUS: Origin: medial 1/3 rd of superior nuchal line., ligamentum nuchae, external occipital protuberance and spines of C7-T12 veebrae. Inseion:-lateral 1/3rd of clavicle., medial margin of acromion,superior margin of spine of scapula. Nerve supply: spinal accessory( motor),C3,C4 spinal nerves ( proprioceptive). Action:- upper fibres elevate scapula,'middle fibres retract ,and lower fibres depress scapula. {Reference: vishram singh, pg no. 72}