Superficial Transverse Perineal
Pelvis & Perineum · Trunk
The superficial transverse perineal muscle is a slender, transversely running slip in the superficial perineal pouch. It arises from the inner and anterior part of the ischial tuberosity and ischial ramus and runs medially to insert into the perineal body, the central tendon of the perineum. Meeting its fellow of the opposite side at the midline, it helps fix and stabilise the perineal body, providing a firm anchor for the many muscles that converge there. Its steadying role supports the pelvic floor during increases in intra-abdominal pressure. It is supplied by the perineal branch of the pudendal nerve (S2-S4).
Origin, Insertion, Action & Nerve
Origin
Inner and anterior part of the ischial tuberosity and ramus
Insertion
Perineal body (central tendon of the perineum)
Action
Stabilizes and supports the perineal body
Nerve
Perineal branch of the pudendal nerve (S2–S4)
Attachments explained
The Superficial Transverse Perineal 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
Inner and anterior part of the ischial tuberosity and ramus
Insertion
Perineal body (central tendon of the perineum)
Action & function
When the Superficial Transverse Perineal contracts, it produces the following movement: Stabilizes and supports the perineal body.
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 Superficial Transverse Perineal receives its nerve supply from the Perineal branch of the pudendal nerve (S2–S4). This nerve carries fibres from spinal segment(s) S2, S4.
Because a muscle can only contract when its nerve is intact, injury to the Perineal branch of the pudendal nerve or to its spinal roots (S2, S4) can weaken or paralyse the Superficial Transverse Perineal, impairing the movements it normally produces (stabilizes and supports the perineal body). This is why knowing the innervation is central to localising nerve lesions in clinical practice.
How to study the Superficial Transverse Perineal (the OIANS method)
Take the name as a description of the whole muscle: it is superficial (in the superficial pouch), transverse (runs side to side), and perineal (ends at the perineal body), so origin on the ischial tuberosity and insertion into the central tendon fall straight out of the label. Its job of stabilising the perineal body follows from being a transverse strut anchored to it.
Group it with ischiocavernosus and bulbospongiosus as the three muscles of the superficial perineal pouch, all supplied by the perineal branch of the pudendal nerve (S2-S4). Learning that shared innervation and shared pouch once lets you recall all three together, while remembering that this particular muscle is a passive stabiliser rather than a sphincter keeps its modest function clear.
Frequently asked questions
Where is the Superficial Transverse Perineal located?
The Superficial Transverse Perineal is a muscle of the Pelvis & Perineum group, located in the Trunk.
What is the origin of the Superficial Transverse Perineal?
Inner and anterior part of the ischial tuberosity and ramus
What is the insertion of the Superficial Transverse Perineal?
Perineal body (central tendon of the perineum)
What movements does the Superficial Transverse Perineal produce?
Stabilizes and supports the perineal body
What nerve supplies the Superficial Transverse Perineal?
Perineal branch of the pudendal nerve (S2–S4)
Is the Superficial Transverse Perineal free to study in OIANS?
The Superficial Transverse Perineal 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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