Perineal membrane

Perineal membrane

Infobox Anatomy
Name = PAGENAME
Latin = membrana perinei
GraySubject = 120
GrayPage = 428


Caption = Coronal section of anterior part of pelvis, through the pubic arch. Seen from in front. (Inferior layer labeled at bottom left.)


Caption2 = Median sagittal section of pelvis, showing arrangement of fasciæ. (Inferior layer labeled at center left.)
System =
MeshName =
MeshNumber =
DorlandsPre = m_08
DorlandsSuf = 12522148
The perineal membrane is an anatomical term for a fibrous membrane in the perineum. The term "inferior fascia of urogenital diaphragm", used in older texts, is considered equivalent to the perineal membrane.

It is the superior border of the superficial perineal pouch, and the inferior border of the deep perineal pouch.

hape and boundaries

It is triangular in shape, and about 4 cm. in depth.

Its apex is directed forward, and is separated from the arcuate pubic ligament by an oval opening for the transmission of the deep dorsal vein of the penis.

Its lateral margins are attached on either side to the inferior rami of the pubis and ischium, above the crus penis.

Its base is directed toward the rectum, and connected to the central tendinous point of the perineum.The base is fused with both the pelvic fascia and Colle's fascia.

Relations

It is continuous with the deep layer of the superficial fascia behind the Transversus perinæi superficialis, and with the inferior layer of the diaphragmatic part of the pelvic fascia.

Perforations

It is perforated, about 2.5 cm. below the symphysis pubis, by the urethra, the aperture for which is circular and about 6 mm. in diameter, by the arteries to the bulb, and the ducts of the bulbourethral glands close to the urethral orifice; by the deep arteries of the penis, one on either side close to the pubic arch, and about halfway along the attached margin of the fascia; by the dorsal arteries and nerves of the penis near the apex of the fascia.

Its base is also perforated by the perineal vessels and nerves, while between its apex and the arcuate pubic ligament the deep dorsal vein of the penis passes upward into the pelvis.

Contents

If the inferior fascia of the urogenital diaphragm is detached on either side, the following structures will be seen between it and the superior fascia:
* the deep dorsal vein of the penis
* the membranous portion of the urethra
* the Transversus perinæi profundus and Sphincter urethræ membranaceæ muscles
* the bulbourethral glands and their ducts
* the pudendal vessels and dorsal nerves of the penis
* the arteries and nerves of the urethral bulb
* a plexus of veins

tructure

The perineal membrane is triangular in shape. It attaches to both ischiopubic rami of the pelvis. It also attaches to the perineal body.


=Additional

External links

* (NormanAnatomyFig|maleugtriangle3, NormanAnatomyFig|maleugtriangle4)


Wikimedia Foundation. 2010.

Игры ⚽ Нужно сделать НИР?

Look at other dictionaries:

  • perineal membrane — membrana perinei …   Medical dictionary

  • membrane — 1. A thin sheet or layer of pliable tissue, serving as a covering or envelope of a part, as the lining of a cavity, as a partition or septum, or to connect two structures. SYN: membrana [TA]. 2. SYN: biomembrane. [L. membrana, a skin or m …   Medical dictionary

  • Deep perineal pouch — Coronal section of anterior part of pelvis, through the pubic arch. Seen from in front. (Deep perineal pouch not labeled, but is between the superior layer and inferior layer labeled at bottom left.) …   Wikipedia

  • Deep transverse perineal muscle — Muscles of the female perineum. (Transversus perinei visible at center right.) …   Wikipedia

  • Superficial perineal pouch — Infobox Anatomy Name = PAGENAME Latin = compartimentum superficiale perinei GraySubject = GrayPage = Caption = Coronal section of anterior part of pelvis, through the pubic arch. Seen from in front. (Superficial perineal pouch is white outline at …   Wikipedia

  • Deep branch of the perineal nerve — Nerve: Deep branch of the perineal nerve Pudendal nerve, its course through the lesser sciatic foramen, and branches, including deep perineal nerve at bottom …   Wikipedia

  • Muscle — is the tissue of the body which primarily functions as a source of power. There are three types of muscle in the body. Muscle which is responsible for moving extremities and external areas of the body is called "skeletal muscle." Heart… …   Medical dictionary

  • Fascia — A flat band of tissue below the skin that covers underlying tissues and separates different layers of tissue. Fascia encloses muscles. Inflammation of the fascia is referred to as fasciitis. Fascia is the Latin word for band or bandage. * * * A… …   Medical dictionary

  • space — Any demarcated portion of the body, either an area of the surface, a segment of the tissues, or a cavity. SEE ALSO: area, region, zone. SYN: spatium [TA]. [L. spatium, room, s.] alveolar dead s …   Medical dictionary

  • Ligament — A ligament is a tough band of connective tissue that connects various structures such as two bones. Ligament is a fitting term; it comes from the Latin ligare meaning to bind or tie. * * * 1. A band or sheet of fibrous tissue connecting two or… …   Medical dictionary

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”