This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
Galen's anastomosis is between ? 
Select and explain. 
A. Recurrent laryngeal nerve and external laryngeal nerve, B. Recurrent laryngeal nerve and internal laryngeal nerve, C. Internal laryngeal nerve and external laryngeal nerve, D. None of the above
B: Recurrent laryngeal nerve and internal laryngeal nerve
Answer: B: Recurrent laryngeal nerve and internal laryngeal nerve 
Explanation: There are two types of impoant anastmosis between laryngeal branches of vagus :? 1) Galen anastomosis (Ramus anastomoticus or Ansa of Galen) This is an anastomosis between the recurrent laryngeal nerve and internal laryngeal nerve (internal branch of superior laryngeal nerve). Generally, posterior branch of recurrent laryngeal nerve contributes to the anastomosis; however, anterior branch can also contribute. 2) Human communicating nerve It is an anastomosis between recurrent laryngeal nerve (distal pa) and external laryngeal nerve (external branch of superior laryngeal nerve).