Superficial transverse perineal muscle

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Superficial transverse perineal muscle
Median sagittal section of pelvis, showing arrangement of fasciæ. (Transversus perinei superficialis visible at bottom right.)
The superficial branches of the internal pudendal artery. (Transversus perinei labeled at center left.)
Latin musculus transversus perinei superficialis
Gray's subject #120 427
Origin anterior part of ischial tuberosity
Insertion    central point of perineum
Nerve: pudendal nerve

The Transversus perinei superficialis (Transversus perinei; Superficial transverse perineal muscle) is a narrow muscular slip, which passes more or less transversely across the perineal space in front of the anus.

Origin and insertion

It arises by tendinous fibers from the inner and forepart of the tuberosity of the ischium, and, running medialward, is inserted into the central tendinous point of the perineum, joining in this situation with the muscle of the opposite side, with the Sphincter ani externus behind, and with the Bulbocavernosus in front.

In some cases, the fibers of the deeper layer of the Sphincter ani externus decussate in front of the anus and are continued into this muscle. Occasionally it gives off fibers, which join with the Bulbocavernosus of the same side.

Variations are numerous. It may be absent or double, or insert into Bulbocavernosus or External sphincter.

Additional images

External links

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.