Sacrum - Parts

Parts

  • The pelvic surface of the sacrum is concave from above downward, and slightly so from side to side.
  • The dorsal surface of the sacrum is convex and narrower than the pelvic.
  • The lateral surface of the sacrum is broad above, but narrowed into a thin edge below.
  • The base of the sacrum, which is broad and expanded, is directed upward and forward.
  • The apex (apex oss. sacri) is directed downward, and presents an oval facet for articulation with the coccyx.
  • The vertebral canal (canalis sacralis; sacral canal) runs throughout the greater part of the bone; above, it is triangular in form; below, its posterior wall is incomplete, from the non-development of the laminae and spinous processes. It lodges the sacral nerves, and its walls are perforated by the anterior and posterior sacral foramina through which these nerves pass out.

Read more about this topic:  Sacrum

Famous quotes containing the word parts:

    The squirming facts exceed the squamous mind, If one may say so.
    Wallace Stevens 1879–1955, U.S. poet. “Connoisseur of Chaos,” Parts of a World (1942)

    All are but parts of one stupendous whole,
    Whose body Nature is, and God the soul;
    Alexander Pope (1688–1744)

    The Indian navigator naturally distinguishes by a name those parts of a stream where he has encountered quick water and forks, and again, the lakes and smooth water where he can rest his weary arms, since those are the most interesting and more arable parts to him.
    Henry David Thoreau (1817–1862)