Thiele's

Description

Origin: Anterior part of ischial tuberosity

Insertion: Central point of perineum

Nerve: Pudendal nerve

Description:

MALE:
The Transversus perinaei superficialis (Transversus perinaei; Superficial transverse perineal muscle) is a narrow muscular slip, which passes more or less transversely across the perineal space in front of the anus. 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.
Actions.—The simultaneous contraction of the two muscles serves to fix the central tendinous point of the perineum.

FEMALE:
The Transversus perinaei superficialis (Transversus perinaei; Superficial transverse perineal muscle) in the female is a narrow muscular slip, which arises by a small tendon from the inner and forepart of the tuberosity of the ischium, and is inserted into the central tendinous point of the perineum, joining in this situation with the muscle of t
Action.—The simultaneous contraction of the two muscles serves to fix the central tendinous point of the perineum. he opposite side, the Sphincter ani externus behind, and the Bulbocavernosus in front.


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