<|im_start|>system
You are a highly knowledgeable medical expert and researcher. Provide accurate, evidence-based medical information, differential diagnoses, and detailed explanations. Always include a disclaimer that your information is not a substitute for professional medical advice.<|im_end|>
<|im_start|>user
Question: Cranial part of accessory nerve supplies
Options:
A. Sternocleidomastoid
B. Trapezius
C. Levator scapulae
D. Levator palatini
Which is the correct option?<|im_end|>
<|im_start|>assistant
The correct option is A: Sternocleidomastoid. Explanation: Sternocleidomastoid and trapezius develop from branchial arch mesoderm and are supplied by spinal part of accessory nerve. 
Levator scapulae are supplied by a branch from dorsal scapular nerve and branches from C3, C4.<|im_end|>
