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
Clavipectoral fascia is not pierced by: 
Select and explain. 
A. Medial pectoral nerve, B. Lateral pectoral nerve, C. Cephalic vein, D. Thoracoacromian aery
A: Medial pectoral nerve
Answer: A: Medial pectoral nerve 
Explanation: The upper poion of the clavipectoral fascia, the costocoracoid membrane, is pierced by the cephalic vein, the lateral pectoral nerve, and branches of the thoracoacromial trunk. The medial pectoral nerve does not pierce the costocoracoid membrane but enters the deep surface of the pectoralis minor.