This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Anatomy
All the following muscles are attached to the posterior pa of lateral surface of mastoid process except 
Select and explain. 
A. Posterior belly of Digastric muscle, B. Sternocleidomastoid, C. Splenius capitus, D. Longissimus capitis
A: Posterior belly of Digastric muscle
Answer: A: Posterior belly of Digastric muscle 
Explanation: The sternocleidomastoid, splenius capitis, and longissimus capitis are inseed in that order from before backwards on the posterior pa of the lateral surface of the mastoid processPosterior belly of digastric arises from the mastoid notch.Reference: Chourasia; 6th edition; 13th page