Pelvis - The bony pelvic structures

An important part of all functions are the bony structures of the pelvic ring. These include the sacrum, hipbones and sacroiliac joint.

Sacrum, hipbones and sacroiliac joint

Sacrum (Os sacrum): This is a part of the lower spine that forms the back wall of the pelvis and connects it up with the lumbar spine.

Hüftbeine (Ossa coxae): These two structures follow each other on the sides of the sacrum and each consist of three bones, which are fused together:

  • Above the ilium, with its large iliac scoop and outer perimeter, the iliac crest and several protrusions, the iliac spines. From the iliac crest bone marrow can be taken, the bony prominences serve as orientation for therapists. B. when a syringe must be administered in the Pomuskel.
  • Downwards behind, the ischialis (Os ischii) follows, whose outward oblique protrusions are called the ischial tuberosities. After a long ride on a hard saddle, these are often clearly felt.
  • The pubic bone (pubis) lies down in front, the respective arcuate foothills meet in the middle as a pubic symphysis and thus close the ring of the pelvic girdle.

Where the intestinal, seat and pubic bone abut each other, they form the left and right cup-like acetabulum pan, in each of which the head of the femur lies. Pan and condyle together with strong ligaments form the strong hip joint. The hip joint and pelvis together are referred to as the hip, which from the outside corresponds to the area between the upper edge of the pelvis and the neck of the thigh.

Sacroiliac Joint: Although this connection between the ilium and the sacrum on the left and right of the spine is almost immobile due to solid ligaments, it can cause discomfort through minimal dislocation. Such blockages are often addressed by orthopedists or osteopaths.

Big and small pool

It is distinguished between large and small pelvis, which are separated by an imaginary line (linea terminalis). This runs arcuately on the inside of the pelvic ring from a projection of the sacrum to obliquely forward down below to the upper edge of the pubic symphysis. Thus, the upper pelvis major is bounded by the iliac shovels and pubis and is open to the front, the pelvic minor is covered at the back of the coccyx and tailbone, laterally and in the front of the pubic and sessile legs.

Too tight pelvis?

In obstetrics, the linea terminalis and the small pelvis play a major role - after all, its diameter determines significantly whether the child's head fits through the so-called birth canal (which is actually not a canal but a mobile bone belt). By nature, the woman not only has an outwardly different hip shape than her male counterpart, but is also well-equipped for the task of childbirth - the bones are slightly differently shaped and arranged than in the male, so the female pelvis has a larger diameter Has.

By the way: A really too tight pelvis (ie a mismatch between the diameter of the pelvis and childish head) is quite rare - usually the two are just not optimally to each other. Normally, the head has the largest part of the baby's body - after all, the female pelvis has a volume of about 1000 ml.

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