ischium

(noun)

The most inferior of the three bones that make up each side of the pelvis.

Examples of ischium in the following topics:

  • Ischium

    • The ischium forms the lower and posterior portion of the hip bones of the pelvis.
    • The ischium forms the lower and back part of the hip bone .
    • The inferior ramus of the ischium is thin and flattened and ascends from the superior ramus of the ischium to join the inferior ramus of the pubis.
    • The ischium is located below the ilium and behind the pubis.
    • The ischium is labeled at the bottom left of the ilium.

  • Pubis

    • The pubic bone articulates with the ilium and the ischium on each hip.
    • It passes laterally and downward from the medial end of the superior ramus, and becomes narrower as it descends and joins with the inferior ramus of the ischium below the obturator foramen.
    • (1) sacrum, (2) ilium, (3) ischium, (4) pubis: 4a-body; 4b-superior ramus; 4c-inferior ramus, (5) pubic symphisis, (6) acetabulum, (7) obturator foramen, (8) coccyx, (red dotted line) linea terminalis.

  • Ilium

    • It articulates with the sacrum, ischium, and pubis.

  • Comparison of Female and Male Pelves

    • The distance between the ischium bones is small in males.

  • False and True Pelves

    • The true (or lesser) pelvis is bounded in front and below by the pubic symphysis and the superior rami of the pubis; above and behind, by the sacrum and coccyx; and laterally, by a broad, smooth, quadrangular area of bone, corresponding to the inner surfaces of the body and superior ramus of the ischium, and the part of the ilium below the arcuate line.

  • Overview of the Appendicular Skeleton

    • In some vertebrates, including humans, the ox coxa is comprised of three bones: the ilium, ischium, and pubis.

  • Human Appendicular Skeleton

    • In adults, the hip bones are formed by the fusion of three pairs of bones: the ilium, ischium, and pubis.