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
Intracapsular but extrasynol is ? 
Select and explain. 
A. Long head of triceps, B. Long head of biceps, C. Sho head of biceps, D. Medial head of biceps
B: Long head of biceps
Answer: B: Long head of biceps 
Explanation: Origin of long head of biceps is intracapsular but extrasynol, enclosed by a prolongation of synol membrane of shoulder joint.