Final answer:
The Glands of Littre(option C) are unique to the male urethra and are not present in the female urethra.
Step-by-step explanation:
The structure that is present in the male urethra but not in the female urethra is the Glands of Littre. These glands, also known as urethral glands, are responsible for secreting mucus into the urethral canal. They are located along the length of the male urethra. The stratified squamous epithelium, transitional epithelium, external sphincter of skeletal muscle, and connective tissue layer underlying the epithelium are structures that can be found in both male and female urethras, which makes C) Glands of Littre the correct choice.