Obturator foramen

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Obturator foramen
Skeletal pelvis-pubis.svg
Pelvis. Obturator foramen is 7.
Gray321.png
Symphysis pubis exposed by a coronal section. Obturator canal labelled at center.
Details
Identifiers
Latin foramen obturatum
TA98 A02.5.01.008
TA2 1314
FMA 16999
Anatomical terms of bone

The obturator foramen is the large,[ citation needed ] bilaterally paired opening of the bony pelvis. It is formed by the pubis and ischium. It is mostly closed by the obturator membrane except for a small opening - the obturator canal - through which the obturator nerve and vessels pass.

Contents

Structure

The obturator foramen is situated inferior and somewhat anterior to the acetabulum. It is bounded by the pubis bone and the ischium: superiorly by the (grooved obturator surface) of the superior ramus of pubis, inferiorly by the ramus of ischium, and laterally by (the anterior edge of) the body of ischium (including by the margin of the acetabulum). [1]

The margin of the foramen is thin and uneven, and gives attachment to the obturator membrane. Superiorly, it presents a deep groove - the obturator groove - which passes obliquely inferomedially from the pelvis.[ citation needed ]

The foramen is largely closed by the obturator membrane save for a small opening at the superolateral end of the obturator foramen - the obturator canal - which establishes a communication between the pelvic cavity and the thigh. This canal gives passage to the obturator nerve, artery, and veins. [1]

The free edge of the obturator membrane that bounds the obturator canal attaches at two tubercles (which may be indistinct): [1]

Variation

In accordance with the overall sex dimorphism of the pelvis,[ citation needed ] the obturator foramina are oval in the male, and wider and rather triangular in the female. [1]

Unilateral pelvic hypoplasia can cause differences in size between the obturator foramina. Rarely, the obturator foramen may be doubled on one side. [2]

See also

Additional images

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References

PD-icon.svgThis article incorporates text in the public domain from page 237 of the 20th edition of Gray's Anatomy (1918)

  1. 1 2 3 4 5 6 Standring, Susan (2020). Gray's Anatomy: The Anatomical Basis of Clinical Practice (42th ed.). New York. p. 1354. ISBN   978-0-7020-7707-4. OCLC   1201341621.{{cite book}}: CS1 maint: location missing publisher (link)
  2. Apostolos Karantanas; Konstantina Velesiotou & Evagelos Sakellariou (2002). "Double Obturator Foramen". American Journal of Roentgenology. Larissa General Hospital, Greece. 178 (1): 245. doi:10.2214/ajr.178.1.1780245. PMID   11756138.