Structure/Morphology
The vestibular bulbs are bilateral structures that sit on both sides of the vaginal orifice. They are approximately 3 cm long and consist of erectile tissue.
Key Features/Anatomical Relations
They are located within the superficial perineal pouch, are covered by the bulbospongiosus muscles, and are attached to the perineal membrane. The posterior portions of the bulbs are in contact with the greater vestibular glands. The anterior portions of the bulbs are joined by a commissure (commissure of bulbs) and attach to the clitoris through two small bands of erectile tissue.
Function
The bulbs fill with blood during arousal to cause an erection.
