SURGICAL ANATOMY. 389 



Inferior hamiorrho'idal vessels and nerves; 

 Accelerator urinaa muscle; 



Superficial perineal vessels and nerve (sometimes) ; 

 Deep perineal fascia; 

 Anterior part of levator ani ; 

 Part of compressor urethras ; 

 Membranous and prostatic positions of urethra; 

 Left lobe of prostate gland. 

 The structures to be avoided are : 

 In median line, rectum and bulb of corpus spongiosum ; 

 Externally, internal pudic artery; 

 Forward, artery of the bulb ; 



Backward, posterior part of prostatic gland and neck of the 

 bladder. 



