The posterior sacrococcygeal ligament or dorsal sacrococcygeal ligament
[OMD: Definition] is a
ligament
A ligament is the fibrous connective tissue that connects bones to other bones. It is also known as ''articular ligament'', ''articular larua'', ''fibrous ligament'', or ''true ligament''. Other ligaments in the body include the:
* Peritoneal li ...
which stretches from the
sacrum
The sacrum (plural: ''sacra'' or ''sacrums''), in human anatomy, is a large, triangular bone at the base of the spine that forms by the fusing of the sacral vertebrae (S1S5) between ages 18 and 30.
The sacrum situates at the upper, back part ...
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
The sacrum (plural: ''sacra'' or ''sacrums''), in human anatomy, is a large, triangular bone at the base of the spine that forms by the fusing of the sacral vertebrae (S1S5) between ages 18 and 30.
The sacrum situates at the upper, back part o ...
. On either side, two
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.
Together with the anterior, posterior, and inter ...
s run between the transverse processes of the coccyx and the inferior lateral angle of the sacrum.
[Sinnatamby (2006), p 336]
It is in relation, behind, with the
gluteus maximus
The gluteus maximus is the main extensor muscle of the hip. It is the largest and outermost of the three gluteal muscles and makes up a large part of the shape and appearance of each side of the hips. It is the single largest muscle in the human ...
.
Deep part
The deep dorsal sacrococcygeal ligament (ligamentum sacrococcygeum posterius profundum) is a continuation of the
posterior longitudinal ligament.
A flat band arising inside the
sacral canal
The sacrum (plural: ''sacra'' or ''sacrums''), in human anatomy, is a large, triangular bone at the base of the spine that forms by the fusing of the sacral vertebrae (S1S5) between ages 18 and 30.
The sacrum situates at the upper, back part o ...
, posteriorly at the orifice of the fifth sacral segment, it descends to the dorsal surface of the coccyx under its longer fellow described below.
[Morris (2005), p 59]
Superficial part
The superficial dorsal sacrococcygeal ligament (ligamentum sacrococcygeum posterius superficiale) originates on the free margin of the
sacral hiatus 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.
See also
*
Anterior sacrococcygeal ligament
*
Coccydynia
Coccydynia is a medical term meaning pain in the coccyx or tailbone area, often brought on by a fall onto the coccyx or by persistent irritation usually from sitting.
Synonyms
Coccydynia is also known as coccygodynia, coccygeal pain, coccyx pain, ...
(coccyx pain, tailbone pain)
*
Ganglion impar
Notes
References
*
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*
Ligaments of the torso
Bones of the vertebral column
{{ligament-stub