Final answer:
The part of the male urethra that is not a part of it is the Urachus. It is related to fetal development connecting the fetal bladder to the umbilicus, not the adult male urethra.
Step-by-step explanation:
The component of the male urethra that is not a part of it is d. Urachus. The male urethra is divided into several regions: the preprostatic urethra, the prostatic urethra, the membranous urethra, and the spongy or penile urethra which are all parts of the urethra through which both urine and semen pass in males. The urachus is related to early fetal development connecting the fetal bladder to the umbilicus, but it is not a part of the adult male urethra.