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The pelvic axes are imaginary lines passing through the center of the two ischial processes, through the superior rami of the pubis and trochanteric bones, and along the midpoint of the sacrum. There may be several axes of the pelvis, running in different directions. The most common axis is the anterior sagittal plane. It passes through the posterior border of the sacrum, the neck of the femur, the middle trochanter and the anterior border of the pubic bones. If the axes of the pelvic bones are not in the same direction, then we can talk about an oblique pelvis.

The pelvis is formed by four condyles, which are distinguished by paired anterior and posterior iliac spines, spinous and pubic eminences and lateral sacral protrusions. The area between the sacral prominence and the semigluteal line is called the sacral ridge.

The roof of the skull is formed by the parietal and occipital tubercles, and therefore there are 2 options for the relative position of the sacral cavity, and therefore the roof of the skull:

- scoliotic (with narrowing of the sacral cavity and flattening of the roof of the skull);

- vulture-shaped (the roof of the skull is moderately convex).

The pelvic axis is important in such areas of clinical anatomy as obstetrics and gynecology, orthopedics and traumatology, prosthetics and orthopedic dentistry, neurosurgery, and otorhinolaryngology.