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Perineum

Perineum
The muscles of the male perineum
Gray's subject #120 424
Artery perineal artery, dorsal artery of the penis, deep artery of the penis
Nerve perineal nerve, posterior scrotal nerves, dorsal nerve of the penis, dorsal nerve of clitoris
Lymph primarily superficial inguinal lymph nodes
Dorlands/Elsevier p_13/12627677

In human anatomy, the perineum, also called the "taint", "grundel" or "gooch", is generally defined as the surface region in both males and females between the pubic symphysis and the coccyx.

A diamond-shaped area on the inferior surface of the trunk which includes the anus and, in females, the vagina[1]. Its definition varies: it can refer to only the superficial structures in this region, or it can be used to include both superficial and deep structures.

The perineum corresponds to the outlet of the pelvis.

The anogenital distance is a measure of male feminisation measuring the distance between the anus and the base of the penis. Studies show that the perineum is twice as long in males as in females. The AGD in males may be shortened through exposure to phthalates found in some plastics.

Boundaries

Its deep boundaries are as follows:[2]

In Alfred Kinsey's 1967 report, he concluded that the perineum was one of the 6 key errogenous zones for males.

Triangles

A line drawn transversely across in front of the ischial tuberosities divides the space into two triangles:

Name Location Contents
Urogenital triangle the anterior triangle in females, contains the vagina
Anal triangle the posterior triangle contains the anus

Perineal fascia

The terminology of the perineal fascia can be confusing, and there is some controversy over the nomenclature. This stems from the fact that there are two parts to the fascia, the superficial and deep parts, and each of these can be subdivided into superficial and deep parts.

The layers and contents are as follows, from superficial to deep:

  • 2) superficial perineal fascia: Subcutaneous tissue divided into two layers: (a) A superficial fatty layer, and (b) Colles' fascia, a deeper, membranous layer.
  • 3) deep perineal fascia and muscles:
superficial perineal pouch Contains superficial perineal muscles: transversus perinei superficialis, bulbospongiosus, ischiocavernosus
inferior fascia of urogenital diaphragm, or perineal membrane A membranous layer of the deep fascia.
deep perineal pouch Contains the deep perineal muscles: transversus perinei profundus, sphincter urethrae membranaceae
superior fascia of the urogenital diaphragm Considered hypothetical by some modern anatomists, but still commonly used to logically divide the contents of the region.

Areas of the perineum

The region of the perineum can be considered a distinct area from pelvic cavity, with the two regions separated by the pelvic diaphragm. The following areas are thus classified as parts of the perineal region:

Riding

This area can become extremely sore among inexperienced bicyclists, horseback riders, motocross riders, and even ATV'ers.[citation needed]

Additional images


References

  1. ^ Gray, Henry. Anatomy of the Human Body. Philadelphia: Lea & Febiger, 1918; Bartleby.com, 2000.
  2. ^ perineumboundaries

External links

The content of this section is licensed under the GNU Free Documentation License (local copy). It uses material from the Wikipedia article "Perineum" modified October 20, 2007 with previous authors listed in its history.