In its entire length, the sacrospinous ligament covers the equally triangular coccygeus muscle, to which its closely connected.

The pudendal vessels and nerve pass behind the sacrospinous ligament directly medially and inferiorly to the ischial spine.

The inferior gluteal artery, from a branch of the internal iliac artery, pass behind the sciatic nerve and the sacrospinous ligament and is left uncovered in a small opening above the top of the sacrospinous ligament.

The main body of the inferior gluteal artery leaves the pelvis posteriorly to the upper border of the sacrospinous ligament, to follow the inferior portion of the sciatic nerve out of the greater sciatic foramen.

[4] This article incorporates text in the public domain from page 309 of the 20th edition of Gray's Anatomy (1918)