Posterior sacrococcygeal ligament

Posterior sacrococcygeal ligament
Articulations of pelvis. Posterior view. (Superficial posterior sacrococcygeal ligament labeled at bottom left.)
Details
From	Sacrum
To	Coccyx
Identifiers
Latin	ligamentum sacrococcygeum posterius, ligamentum sacrococcygeum dorsale
TA98	A03.2.08.003
TA2	1689, 1690
FMA	326294
Anatomical terminology [edit on Wikidata]

The posterior sacrococcygeal ligament or dorsal sacrococcygeal ligament^[1] 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 ligaments run between the transverse processes of the coccyx and the inferior lateral angle of the sacrum.^[2]

It is in relation, behind, with the gluteus maximus.

Deep part

The deep dorsal sacrococcygeal ligament (ligamentum sacrococcygeum posterius profundum) is a continuation of the posterior longitudinal ligament.^[1] 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.^[3]

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.^[3]

Notes

^ ^a ^b OMD: Definition
^ Sinnatamby (2006), p 336
^ ^a ^b Morris (2005), p 59

References

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

Morris, Craig E. (2005). Low Back Syndromes: Integrated Clinical Management. McGraw-Hill. ISBN 0-07-137472-8.
"deep dorsal sacrococcygeal ligament". On-line Medical Dictionary. 2000-03-05. Retrieved 2008-10-13.
Sinnatamby, Chummy S.; Last, Raymond Jack (2006). Last's Anatomy: Regional and Applied. Elsevier Health Sciences. ISBN 0-443-10033-0.

Joints and ligaments of torso

Vertebral

Syndesmosis

Of vertebral bodies	anterior longitudinal ligament posterior longitudinal ligament
Of vertebral arches	ligamenta flava supraspinous ligament nuchal ligament interspinous ligament intertransverse ligament

Symphysis

Synovial joint

Atlanto-axial	Medial: Cruciate ligament of atlas (Transverse ligament of atlas) Alar ligament Apical ligament of dens Tectorial membrane of atlanto-axial joint Lateral: no ligaments anterior atlantoaxial ligament posterior atlantoaxial ligament
Zygapophysial	no ligaments
Lumbosacral	iliolumbar ligament
Sacrococcygeal	anterior sacrococcygeal ligament posterior sacrococcygeal ligament

Thorax

Costovertebral

Head of rib	Radiate ligament Intra-articular ligament
Costotransverse	Costotransverse ligament Lumbocostal ligament

Sternocostal

Interchondral

no ligaments

Costochondral

no ligaments

Pelvis

Syndesmoses of pelvic girdle	Obturator membrane Obturator canal
Pubic symphysis	superior pubic ligament inferior pubic ligament
Sacroiliac	anterior sacroiliac ligament posterior sacroiliac ligament interosseous sacroiliac ligament ligaments connecting the sacrum and ischium: sacrotuberous ligament sacrospinous ligament