bulbospongiosus muscle in dogs

The bulbospongiosus is the thick extrapelvic continuation of the urethralis. It originates from the perineal body (and midline raphe over corpus spongiosum in male) and inserts at the superficial perineal membrane and dorsal penile or clitoral aponeurosis. In males, the bulbospongiosus muscles are united and surround the base of the penis. They aid in emptying of urine and ejaculate from urethra. In females, these muscles are separated in the middle by the vagina and act to constrict the vaginal introitus. They can also stop the flow of blood into veins, which maintains an erection in the penis of the male and the clitoris of the female. Its nerve connection is the perineal branch of the pudendal nerve (S2, 3, 4). Every claim on this page comes from the Leumas anatomy graph and carries its source.

What the bulbospongiosus muscle is

The bulbospongiosus is the thick extrapelvic continuation of the urethralis. It originates from the perineal body (and midline raphe over corpus spongiosum in male) and inserts at the superficial perineal membrane and dorsal penile or clitoral aponeurosis. In males, the bulbospongiosus muscles are united and surround the base of the penis. They aid in emptying of urine and ejaculate from urethra. In females, these muscles are separated in the middle by the vagina and act to constrict the vaginal introitus. They can also stop the flow of blood into veins, which maintains an erection in the penis of the male and the clitoris of the female. Its nerve connection is the perineal branch of the pudendal nerve (S2, 3, 4). The atlas records it as a muscle at the organ scale in the dog.

Where the bulbospongiosus muscle is

It sits in the pelvis and trunk, within the muscular system. Only the region is known. The position shown is somewhere plausible inside it and nothing more.

What the bulbospongiosus muscle connects to

The atlas records 4 typed relationships for it, across 4 kinds of connection. part of perineum.

Supply and innervation

This dataset asserts no arterial supply, venous drainage or innervation for the bulbospongiosus muscle. Only a minority of structures carry those edges here, so an empty answer means nothing has been recorded — not that there is nothing to record.

Also called

Also recorded as bulbospongiosus, musculus bulbospongiosus, bulbocavernosus, bulbocavernosus muscle and bulbocavernous. Searching any of those names reaches this page.

Source

Uberon multi-species anatomy ontology (Mungall et al.), CC BY 4.0. Term UBERON:0011389, version 2026-06-19, retrieved 2026-08-24. Licence: CC-BY-4.0.

• Part of: perineum.
• A kind of: perineal muscle.
• Continuous with: external anal sphincter.
• subtype: constrictor vulvae muscle.

Questions

Where is the bulbospongiosus muscle?

It sits in the pelvis and trunk, within the muscular system. Only the region is known. The position shown is somewhere plausible inside it and nothing more.

What does the bulbospongiosus muscle connect to?

Part of: perineum.

Is the bulbospongiosus muscle the same in other species?

This page describes the dog. The human record of the same structure sits beside it on /compare, over one shared model rather than two atlases built separately.