[1] Ginger et al. state that although a number of texts report that they surround the vaginal opening, this does not appear to be the case and tunica albuginea does not envelop the erectile tissue of the bulb.

[2] Their posterior ends are expanded and are in contact with the greater vestibular glands; their anterior ends form the infra-corporeal residual spongy part (RSP), which are tapered and joined to one another (the commissure of the bulbs) by the pars intermedia; their deep surfaces are in contact with the inferior fascia of the urogenital diaphragm; superficially, they are covered by the bulbospongiosus.

The residual spongy part is a strand of erectile tissue that runs ventrally across the external clitoral body and ends as the glans clitoridis.

As the clitoral bulbs fill with blood, they tightly cuff the vaginal opening, causing the vulva to expand outward.

This puts pressure on nearby structures that include the corpora cavernosa and crura, inducing pleasure.