Transverse Perineal Muscle: Superficial Anatomy Explained

The superficial transverse perineal muscle is a narrow muscular slip that passes across the perineal space in front of the anus. It provides structural support to the perineal body and adjacent pelvic and perineal structures. The perineum is the space below the levator ani and includes the external genitalia, urethra, and anus. The superficial transverse perineal muscle is one of two transverse perineal muscles, the other being the deep transverse perineal muscle, which lies in the perineum, a part of the pelvic floor.

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The superficial transverse perineal muscle stabilises the perineal body

The superficial transverse perineal muscle (transversus superficialis perinei or Lloyd-Beanie muscle) is a narrow muscular slip that passes across the perineal space in front of the anus. The perineum is the space below the levator ani and includes the external genitalia, urethra, and anus. The perineal body, located in the perineum, serves as a critical point of muscular convergence and reinforcement.

The perineal body acts as a point of attachment for muscle fibres from the pelvic floor and the perineum itself. In addition to the superficial transverse perineal muscle, other muscles attaching to the perineal body include the levator ani, bulbospongiosus muscle, deep transverse perineal muscle, external anal sphincter muscle, and external urethral sphincter muscle fibres.

The deep transverse perineal muscle lies in the perineum, a part of the pelvic floor. It arises from the inferior rami of the ischium and runs to the median plane, where it interlaces with the other deep transverse perineal muscle of the opposite side. The function of the deep transverse perineal muscle is similar to that of the superficial transverse perineal muscle, as it helps fix the perineal body, supports the pelvic floor, and aids in expulsion during reproduction.

In summary, the superficial transverse perineal muscle plays a crucial role in stabilising the perineal body, providing structural support to the pelvic region, and contributing to the overall function and stability of the perineal and pelvic structures.

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It provides structural support to pelvic and perineal structures

The superficial transverse perineal muscle (also known as the transversus superficialis perinei or Lloyd-Beanie muscle) is a narrow muscular slip that passes transversely across the perineal space in front of the anus. The perineum, located between the thighs, is the most inferior part of the pelvic outlet. It includes the external genitalia, urethra, and anus. The superficial transverse perineal muscle plays a crucial role in providing structural support to the pelvic and perineal structures.

The perineal body, located within the perineum, serves as a critical point of muscular convergence and reinforcement. The superficial transverse perineal muscle, along with other muscles such as the bulbospongiosus and deep transverse perineal muscle, attaches to the perineal body. This muscle arises from tendinous fibres originating from the inner and forepart of the ischial tuberosity. It then runs medially to insert into the central tendinous point of the perineum, joining with the muscle of the opposite side.

By attaching to the perineal body and connecting with other muscles, the superficial transverse perineal muscle contributes to the structural integrity and stability of the pelvic and perineal region. It helps to maintain the position and function of the pelvic floor muscles, ensuring proper support for the pelvic organs and structures. This muscle also plays a role in maintaining the integrity of the perineal membrane, a layer of tough fascia that provides attachment sites for the muscles of the external genitalia.

In males, the superficial transverse perineal muscle connects with the external anal sphincter muscle behind and the bulbospongiosus muscle in front. In some cases, it may also send fibres to join with the bulbocavernosus muscle. In females, the muscle exhibits a similar arrangement, attaching to the external anal sphincter and bulbospongiosus muscles. The simultaneous contraction of these muscles helps to fix the central tendinous point of the perineum, providing stability and support to the pelvic and perineal structures.

Overall, the superficial transverse perineal muscle is essential for maintaining the structural integrity of the pelvic and perineal region. By attaching to the perineal body and interacting with other muscles, it provides the necessary support for the proper functioning of the pelvic and perineal structures. This muscle plays a crucial role in ensuring the stability and integrity of the pelvic floor and the structures associated with it.

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It is a narrow muscular slip

The superficial transverse perineal muscle (transversus superficialis perinei or Lloyd-Beanie muscle) is a narrow muscular slip. It is a short, thin skeletal muscle that passes across the perineal space in front of the anus. The muscle fibres travel medially and insert onto the perineal body. The perineal body is a critical point of muscular convergence and reinforcement, providing structural support to adjacent pelvic and perineal structures.

The superficial transverse perineal muscle is one of the muscles of the superficial perineal space, which is found in the urogenital triangle of the perineum. The perineal space is located below the perineal membrane, which separates it from the deep perineal space above. The perineal membrane is perforated by the urethra and, in females, the vagina. The superficial perineal space contains three pairs of muscles within the superficial perineal pouch. These include the ischiocavernosus, bulbospongiosus, and superficial transverse perineal muscles.

The superficial transverse perineal muscle is innervated by the deep branch of the perineal nerve, a branch of the pudendal nerve. It originates from the anterior and medial aspect of the ischial tuberosity and joins with the external anal sphincter muscle behind and the bulbospongiosus muscle in front. In some cases, the deeper layer of the external anal sphincter continues into the superficial transverse perineal muscle. The muscle fibres intertwine with those of the contralateral superficial transverse perineal muscle.

The superficial transverse perineal muscle is important for stabilizing the perineal body and preventing tears in the vaginal wall in women. It also provides structural support to the pelvic and perineal structures.

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It is inserted into the central tendinous point of the perineum

The superficial transverse perineal muscle (also known as the transversus superficialis perinei or Lloyd-Beanie muscle) is a narrow muscular slip that passes across the perineal space in front of the anus. It is inserted into the central tendinous point of the perineum (also known as the perineal body), joining with the muscle of the opposite side, the external anal sphincter muscle, and the bulbospongiosus muscle. The perineum is the most inferior part of the pelvic outlet, located between the thighs. It is separated from the pelvic cavity superiorly by the pelvic floor.

The perineal body acts as a point of attachment for muscle fibres from the pelvic floor and the perineum itself. These include the levator ani, the bulbospongiosus muscle, the superficial and deep transverse perineal muscles, the external anal sphincter muscle, and the external urethral sphincter muscle fibres. The perineal body also extends superiorly into the rectovaginal or rectoprostatic septum, forming part of the pelvic floor support system.

The superficial transverse perineal muscle is one of the muscles of the superficial perineal space, which is found in the urogenital triangle of the perineum. It is a short, thin skeletal muscle that stabilizes the perineal body and provides structural support to adjacent pelvic and perineal structures. The fibres of the superficial transverse perineal muscle travel medially and insert onto the perineal body.

The superficial perineal space contains three pairs of muscles within the superficial perineal pouch, including the ischiocavernosus, bulbospongiosus, and superficial transverse perineal muscles. The superficial perineal pouch is contained between the perineal membrane and the deep perineal fascia, with the inner surface of the ischiopubic ramus on each side bounding it. The general organization of this region is similar in both males and females, although the functions of the muscles differ between the sexes.

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It joins with the external anal sphincter muscle

The superficial transverse perineal muscle joins with the external anal sphincter muscle. This is a circular skeletal muscle that encircles the anal canal and provides voluntary control over defecation. The external anal sphincter muscle is responsible for opening and closing the anus. The superficial transverse perineal muscle is a narrow muscular slip that passes transversely across the perineal space in front of the anus. It arises from tendinous fibres from the inner and forepart of the ischial tuberosity and is inserted into the central tendinous point of the perineum (perineal body).

The perineal body acts as a point of attachment for muscle fibres from the pelvic floor and the perineum. The perineal body is a critical point of muscular convergence and reinforcement. It is a short, thin skeletal muscle that stabilises the perineal body and provides structural support to adjacent pelvic and perineal structures.

The superficial transverse perineal muscle is one of the muscles of the superficial perineal space, which is found in the urogenital triangle of the perineum. The perineum is the most inferior part of the pelvic outlet and lies between the thighs. It can be subdivided into the anterior urogenital triangle and the posterior anal triangle. The anal triangle contains the external anal sphincter muscle.

The superficial transverse perineal muscle is innervated by the deep branch of the perineal nerve, which is a branch of the pudendal nerve. The perineal nerve also innervates the external anal sphincter muscle. This nerve provides sensory innervation to the penis and clitoris. The pudendal nerve travels along the inner surface of the ischial tuberosities, through a canal formed by a thickening of the obturator fascia.

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