Diseases of the reproductive system Musculoskeletal Key The vagina is a multilayered tube 1. Innermost layer(mucosa) is made up of cells similar to the lining of your mouth. A protective layer lubricated by cervical mucus and secretions. 2. Elastic What Causes Clear, Sticky Discharge? The Bartholin's gland is located at the entrance to the vagina, and it secretes mucus, providing vulval and vaginal lubrication. A Bartholin's cyst occurs when the gland becomes blocked, and this can Vaginal Dryness: Causes, Symptoms, Diagnosis, & Treatment Options Thomson Medical Female reproductive system vulva anatomy explained