Pelvic inlet

Pelvic inlet
Bone: Pelvic inlet
Gray238.png
Diameters of superior aperture of lesser pelvis (female).
Latin apertura pelvis superior
Gray's subject #58 239

The pelvic inlet or superior aperture of the pelvis is a planar surface which is typically used to define the boundary between the pelvic cavity and the abdominal cavity (or, according to some authors, between two parts of the pelvic cavity, called lesser pelvis and greater pelvis).

Its position and orientation relative to the skeleton of the pelvis is anatomically defined by its edge, the pelvic brim. The pelvic brim is an approximately apple-shaped line passing through the prominence of the sacrum, the arcuate and pectineal lines, and the upper margin of the pubic symphysis.

Occasionally, the terms pelvic inlet and pelvic brim are used interchangeably.

Contents

Boundaries

The edge of the pelvic inlet (pelvic brim) is formed as follows:

Anteriorly
by the pubic crest (or pubic symphysis)
Laterally
by the iliopectineal line		 (same as other side)
Posteriorly
by the anterior margin of the base of the sacrum (or the ala of sacrum) and sacrovertebral angle (or sacral promontory)

Diameters

It has three principal diameters: antero-posterior (conjugate), transverse, and oblique.

Name Description Average measurement in female
anteroposterior or conjugate diameter or conjugata vera extends from the sacrovertebral angle (promontorium) to the pubic symphysis; about 110 mm.
transverse diameter extends across the greatest width of the superior aperture, from the middle of the brim on one side to the same point on the opposite; about 135 mm.
oblique diameter extends from the iliopectineal eminence of one side to the sacroiliac articulation of the opposite side; about 125 mm.

Additional images

  • Pelvis

External links

v · d · eBones of pelvis / pelvic cavity (TA A02.5.01–03, GA 2.231–241)
General
Ilium
arcuate line
Ischium
no substructures
Pubis
Compound

M: BON/CAR

anat(c/f/k/f, u, t/p, l)/phys/devp/cell

noco/cong/tumr, sysi/epon, injr

proc, drug(M5)

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