Puboperinealis
Pelvis & Perineum · Trunk
The puboperinealis is a small, medial slip of the levator ani that helps anchor the perineal body from above. It arises from the posterior surface of the body of the pubis and runs backward to insert into the perineal body, the fibromuscular hub at the centre of the perineum where several pelvic floor and perineal muscles converge. By drawing the perineal body forward toward the pubis, it tenses this central anchor and contributes to overall support of the pelvic floor. It is supplied by the nerve to levator ani (S3-S4).
Origin, Insertion, Action & Nerve
Origin
Posterior surface of the body of the pubis
Insertion
Perineal body
Action
Draws the perineal body anteriorly, supporting the pelvic floor
Nerve
Nerve to levator ani (S3–S4)
Attachments explained
The Puboperinealis is defined first by where it attaches. Its origin is the more fixed anchor, usually the proximal or more stable end that stays put during contraction, while its insertion is the more mobile point that is pulled toward the origin when the muscle shortens.
Origin
Posterior surface of the body of the pubis
Insertion
Perineal body
Action & function
When the Puboperinealis contracts, it produces the following movement: Draws the perineal body anteriorly, supporting the pelvic floor.
As part of the Pelvis & Perineum group of the Trunk, it works alongside neighbouring muscles to generate smooth, coordinated movement and to stabilise the structures it acts on.
Nerve supply & clinical relevance
The Puboperinealis receives its nerve supply from the Nerve to levator ani (S3–S4). This nerve carries fibres from spinal segment(s) S3, S4.
Because a muscle can only contract when its nerve is intact, injury to the Nerve to levator ani or to its spinal roots (S3, S4) can weaken or paralyse the Puboperinealis, impairing the movements it normally produces (draws the perineal body anteriorly, supporting the pelvic floor). This is why knowing the innervation is central to localising nerve lesions in clinical practice.
How to study the Puboperinealis (the OIANS method)
Read the name for the anatomy: pubo tells you the origin on the pubis, perinealis tells you the insertion into the perineal body, and the action of drawing the perineal body anteriorly follows directly from that line of pull. Grouping it with the other small pubo-named slips of levator ani (puboanalis and pubovaginalis or puboprostaticus) lets you learn them as a family of midline reinforcing bands.
Emphasise the perineal body as the shared target: this muscle exists to stabilise that central tendon, which is the keystone the pelvic floor and perineal muscles all rely on. Remembering that the perineal body is where support converges makes the puboperinealis easy to place, and its nerve to levator ani (S3-S4) keeps it consistent with the rest of the pelvic diaphragm.
Frequently asked questions
Where is the Puboperinealis located?
The Puboperinealis is a muscle of the Pelvis & Perineum group, located in the Trunk.
What is the origin of the Puboperinealis?
Posterior surface of the body of the pubis
What is the insertion of the Puboperinealis?
Perineal body
What movements does the Puboperinealis produce?
Draws the perineal body anteriorly, supporting the pelvic floor
What nerve supplies the Puboperinealis?
Nerve to levator ani (S3–S4)
Is the Puboperinealis free to study in OIANS?
The Puboperinealis is always free to browse. Its full origin, insertion, action and nerve details are open to everyone in the Muscle Directory. Quiz and Flashcard practice for the Trunk is part of the one-time Lifetime upgrade, though; only the Upper Limb decks are free to test yourself on.
Related muscles
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