Sacrospinous ligament

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Ligament: Sacrospinous ligament

Articulations of pelvis. Posterior view.

Nélaton’s line and Bryant’s triangle.
Latin	ligamentum sacrospinosum
Gray's	subject #80
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The sacrospinous ligament (small or anterior sacrosciatic ligament) is thin, and triangular in form; it is attached by its apex to the spine of the ischium, and medially, by its broad base, to the lateral margins of the sacrum and coccyx, in front of the sacrotuberous ligament with which its fibers are intermingled.

It is in relation, anteriorly, with the Coccygeus muscle, to which it is closely connected; posteriorly, it is covered by the sacrotuberous ligament, and crossed by the internal pudendal vessels and nerve.

Its upper border forms the lower boundary of the greater sciatic foramen; its lower border, part of the margin of the lesser sciatic foramen.

Its main function is to prevent posterior rotation of the ilia with respect to the sacrum. Laxity of this ligament alomg with the sacrotuberous ligament allows for this posterior rotation to occur. Stresses to these ligaments occur most often when leaning forward or getting out of a chair.

Articulations of pelvis. Anterior view.

SUNY Figs 17:02-03 - "Posterior view of the bones and ligaments of the hip joint."
Anatomy at Dartmouth hip/hip%20ligaments/ligaments7
Johns Hopkins

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.

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Joints and ligaments of torso

articulations of vertebral bodies: anterior longitudinal ligament - posterior longitudinal ligament

articulations of vertebral arches : ligamenta flava - supraspinous ligament (nuchal ligament) - interspinal ligament - intertransverse ligament

zygapophyseal joint - intervertebral disc

costovertebral, articulation of head of rib: radiate ligament - interarticular ligament, costotransverse

sternocostal, interchondral, costochondral

articulation of the vertebral column with the pelvis: iliolumbar ligament

sacroiliac: anterior sacroiliac ligament - posterior sacroiliac ligament - interosseous sacroiliac ligament

ligaments connecting the sacrum and ischium: sacrotuberous ligament - sacrospinous ligament

sacrococcygeal symphysis: anterior sacrococcygeal ligament - posterior sacrococcygeal ligament

pubic symphysis: superior pubic ligament - inferior pubic ligament