Posterior sacrococcygeal ligament
Encyclopedia
The posterior sacrococcygeal ligament or dorsal sacrococcygeal ligament is a ligament
which stretches from the sacrum
to the coccyx
and thus dorsally across the sacrococcygeal symphysis shared by these two bones.
This ligament is divisible in two parts: A short deep part which unites the two bones, and a larger superficial portion which completes the lower back part of the sacral canal
. On either side, two lateral sacrococcygeal ligament
s run between the transverse processes of the coccyx and the inferior lateral angle of the sacrum.
It is in relation, behind, with the Glutæus maximus.
. A flat band arising inside the sacral canal
, posteriorly at the orifice of the fifth sacral segment, it descends to the dorsal surface of the coccyx under its longer fellow described below.
to attach on the dorsal surface of the coccyx. It closes the posterior aspect of the most distal part of the sacral canal and corresponds to the ligamenta flava
.
Ligament
In anatomy, the term ligament is used to denote any of three types of structures. Most commonly, it refers to fibrous tissue that connects bones to other bones and is also known as articular ligament, articular larua, fibrous ligament, or true ligament.Ligament can also refer to:* Peritoneal...
which stretches from the sacrum
Sacrum
In vertebrate anatomy the sacrum is a large, triangular bone at the base of the spine and at the upper and back part of the pelvic cavity, where it is inserted like a wedge between the two hip bones. Its upper part connects with the last lumbar vertebra, and bottom part with the coccyx...
to the coccyx
Coccyx
The coccyx , commonly referred to as the tailbone, is the final segment of the vertebral column. Comprising three to five separate or fused vertebrae below the sacrum, it is attached to the sacrum by a fibrocartilaginous joint, the sacrococcygeal symphysis, which permits limited movement between...
and thus dorsally across the sacrococcygeal symphysis shared by these two bones.
This ligament is divisible in two parts: A short deep part which unites the two bones, and a larger superficial portion which completes the lower back part of the sacral canal
Sacral canal
The vertebral canal runs throughout the greater part of the sacral bone; above, it is triangular in form; below, its posterior wall is incomplete, from the non-development of the laminæ and spinous processes....
. On either side, two lateral sacrococcygeal ligament
Lateral sacrococcygeal ligament
In the human body, the lateral sacrococcygeal ligaments is a pair of ligaments stretching from the lower lateral angles of the sacrum to the transverse processes of the first coccygeal vertebra....
s run between the transverse processes of the coccyx and the inferior lateral angle of the sacrum.
It is in relation, behind, with the Glutæus maximus.
Deep part
The deep dorsal sacrocyccygeal ligament is a continuation of the posterior longitudinal ligamentPosterior longitudinal ligament
The posterior longitudinal ligament is situated within the vertebral canal, and extends along the posterior surfaces of the bodies of the vertebræ, from the body of the axis, where it is continuous with the membrana tectoria, to the sacrum....
. A flat band arising inside the sacral canal
Sacral canal
The vertebral canal runs throughout the greater part of the sacral bone; above, it is triangular in form; below, its posterior wall is incomplete, from the non-development of the laminæ and spinous processes....
, posteriorly at the orifice of the fifth sacral segment, it descends to the dorsal surface of the coccyx under its longer fellow described below.
Superficial part
The superficial dorsal sacrococcygeal ligament originates on the free margin of the sacral hiatusSacral hiatus
The laminae of the fifth sacral vertebra, and sometimes those of the fourth, fail to meet behind, and thus a sacral hiatus occurs in the posterior wall of the sacral canal....
to attach on the dorsal surface of the coccyx. It closes the posterior aspect of the most distal part of the sacral canal and corresponds to the ligamenta flava
Ligamenta flava
The ligamenta flava are ligaments which connect the laminae of adjacent vertebrae, all the way from the axis to the first segment of the sacrum...
.
See also
- Anterior sacrococcygeal ligament
- CoccydyniaCoccydyniaCoccydynia is a medical term meaning pain in the coccyx or tailbone area, usually brought on by sitting too abruptly.-Diagnosis:A number of different conditions can cause pain in the general area of the coccyx, but not all involve the coccyx and the muscles attached to it. The first task of...
(coccyx pain, tailbone pain) - Ganglion imparGanglion imparThe pelvic portion of each sympathetic trunk is situated in front of the sacrum, medial to the anterior sacral foramina. It consists of four or five small sacral ganglia, connected together by interganglionic cords, and continuous above with the abdominal portion...