Urogenital Diaphragm

The superficial transversus perinei (su"per-fish'al trans-ver'sus per"i-ne'i) consists of a small bundle of muscle fibers that passes medially from the ischial tuberosity along the posterior border of the urogenital diaphragm. It assists other muscles in supporting the pelvic viscera.

In males, the bulbospongiosus (bul"bo-spon"je-o'sus) muscles are united surrounding the base of the penis. They assist in emptying the urethra. In females, these muscles are separated medially by the vagina and constrict the vaginal opening. They can also retard the flow of blood in veins, which helps maintain an erection in the penis of the male and in the clitoris of the female.

The ischiocavernosus (is"ke-o-kav"er-no'sus) muscle is a tendinous structure that extends from the ischial tuberosity to the margin of the pubic arch. It assists the bulbospongiosus muscle.

The sphincter urethrae (sfingk'ter u-re'thre) are muscles that arise from the margins of the pubic and ischial bones. Each arches around the urethra and unites with the one on the other side. Together they act as a sphincter that closes the urethra by compression and opens it by relaxation, thus helping control the flow of urine.

Bulbospongiosus

Ischiocavernosus

Bulbospongiosus

Superficial transversus perinei

Levator ani

Gluteus maximus

External anal sphincter

Ischiocavernosus

Bulbospongiosus

Superficial transversus perinei

Levator ani

Gluteus maximus

External anal sphincter

Orifice Vaginal

Clitoris

Urethral orifice Vaginal orifice

Anus

Clitoris

Urethral orifice Vaginal orifice

Anus

Coccygeus

Levator ani Urogenital diaphragm

Coccygeus

Pelvic Outlet Diaphragm

Figure 9.34

External view of muscles of (a) the male pelvic outlet and (b) the female pelvic outlet. (c) Internal view of female pelvic and urogenital diaphragms.

Symphysis pubis

Figure 9.34

External view of muscles of (a) the male pelvic outlet and (b) the female pelvic outlet. (c) Internal view of female pelvic and urogenital diaphragms.

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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Responses

  • Laila
    How to massage penis muscles anatomy?
    6 years ago
  • pervinca
    What vessels or veins control the diaphragm?
    5 years ago
  • MATTALIC
    Where is the urogenital diaphragm?
    2 years ago

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