system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
In an adult male, on per rectal examination, the following structures can be felt anteriorly except:
assistant
The correct answer is  Internal iliac lymph nodes can be palpated laterally when they are enlarged & not anteriorly Ref: Anatomy Workbook By Colin Hinrichsen, Peter Lisowski, 2007, Page 103