Extraperitoneal space
Encyclopedia
The extraperitoneal space is the portion of the abdomen
Abdomen
In vertebrates such as mammals the abdomen constitutes the part of the body between the thorax and pelvis. The region enclosed by the abdomen is termed the abdominal cavity...

 and pelvis
Pelvis
In human anatomy, the pelvis is the lower part of the trunk, between the abdomen and the lower limbs .The pelvis includes several structures:...

 which does not lie within peritoneum
Peritoneum
The peritoneum is the serous membrane that forms the lining of the abdominal cavity or the coelom — it covers most of the intra-abdominal organs — in amniotes and some invertebrates...

.

It includes:
  • Retroperitoneal space, situated posteriorly to the peritoneum
  • Preperitoneal space, situated anteriorly to the peritoneum
    • Retropubic space
      Retropubic space
      Retropubic space is the extraperitoneal space between the pubic symphysis and urinary bladder.It is also known as "Retzius' space", after Anders Retzius....

      , deep to the pubic bone
      Pubis (bone)
      In vertebrates, the pubic bone is the ventral and anterior of the three principal bones composing either half of the pelvis.It is covered by a layer of fat, which is covered by the mons pubis....

    • Retro-inguinal space, deep to the inguinal ligament
      Inguinal ligament
      The inguinal ligament is a band running from the pubic tubercle to the anterior superior iliac spine. Its anatomy is very important for operating on hernia patients.-Anatomy:...



The space in the pelvis is divided into the following components:
  • prevesical space
  • perivesical space
  • perirectal space
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