Which gland opens on postero lateral margin of vaginal opening:
Bartholin's glands, also known as the greater vestibular glands, are located on either side of the vaginal opening, right? They are in the lower part, posterior to the labia minora. Their ducts open into the vestibule near the hymen. So that's probably the answer.
Skene's glands are the lesser vestibular glands, located near the urethra, so they don't open at the vaginal opening. The correct answer should be Bartholin's glands. The other options might be other glands like the sebaceous glands or something else, but the main ones are Bartholin's and Skene's. So the answer is Bartholin's gland.
**Core Concept**
The question tests knowledge of female genital anatomy, specifically the location and function of vulvar glands. The Bartholin’s glands (greater vestibular glands) are paired exocrine glands responsible for lubrication, located in the lateral vestibular walls.
**Why the Correct Answer is Right**
The Bartholin’s glands open via small ducts on the postero-lateral margins of the vaginal orifice. They secrete mucus to lubricate the introitus during sexual activity. Their anatomical position aligns with the question’s description, distinguishing them from other vulvar glands like Skene’s glands (urethral) or sebaceous glands (labial).
**Why Each Wrong Option is Incorrect**
**Option A:** Skene’s glands (urethral glands) open anteriorly near the urethral meatus, not the vaginal opening.
**Option B:** Sebaceous glands are distributed over the labia but do not open at the vaginal margin.
**Option C:** Bulbourethral glands are male-specific structures, absent in females.
**Clinical Pearl / High-Yield Fact**
Bartholin’s cysts or abscesses occur due to duct obstruction, presenting as painful swelling near the vaginal introitus. Distinguish from Skene’s gland infections (urethral diverticula) clinically.
**Correct Answer: C. Bartholin's gland**