Iliolumbar ligament

Iliolumbar ligament
Articulations of pelvis. Anterior view (iliolumbar ligament labeled at center top)
Articulatios of pelvis. Posterior view (iliolumbar ligament labeled at center top)
Details
FromTransverse process of fifth lumbar vertebra
ToPosterior part of iliac crest
Identifiers
Latinligamentum iliolumbale
TA98A03.2.07.002
TA21853
FMA21493
Anatomical terminology

The iliolumbar ligament is a strong ligament[1] which attaches medially to the transverse process of the 5th lumbar vertebra, and laterally to back of the inner lip of the iliac crest (upper margin of ilium).

Anatomy

The ligament extends inferolaterally from its medial attachment,[1] radiating laterally.[2] It represents the thickened inferior border of anterior and middle layers of thoracolumbar fascia. Inferiorly, the ligament is partially continuous with the lumbosacral ligament[1] (which may be considered an inferior subdivision of the iliolumbar ligament).[3]

Attachments

Medial

The ligament's medial attachment is at the apex[4][2] and anteroinferior aspect of the transverse process of lumbar vertebra L5 (and occasionally an additional weak attachment at the transverse process of L4).[2]

Lateral

Laterally, the ligament attaches onto the posterior part of the inner lip of the iliac crest.[1] More precisely, its lateral attachment is by two main bands:[2]

Development

During in newborns and children, this structure is in fact muscular; the muscle tissue is then gradually replaced by ligamentous tissue until the fifth decade of life.[2]

Variation

Occasionally, a small ligamentous band stretches from the apex of transverse process of L4 inferior-ward to the iliac crest posterior to the main ligament; usually, fibrous strands are found between this latter process and the iliac crest, but these are only considered a true ligament when dense enough.[1]

Function

The iliolumbar ligament strengthens the lumbosacral joint assisted by the lateral lumbosacral ligament, and, like all other vertebral joints, by the posterior and anterior longitudinal ligaments, the ligamenta flava, and the interspinous and supraspinous ligaments.[4] It reduces the range of movement of the lumbosacral joint.[6]

References

  1. ^ a b c d e Palastanga N, Soames R (2012). Anatomy and Human Movement: Structure and Function. Physiotherapy Essentials (6th ed.). Edinburgh: Churchill Livingstone/Elsevier. pp. 283–284. ISBN 978-0-7020-3553-1.
  2. ^ a b c d e f g h i Standring S (2020). Gray's Anatomy: The Anatomical Basis of Clinical Practice (42th ed.). New York. p. 842. ISBN 978-0-7020-7707-4. OCLC 1201341621.{{cite book}}: CS1 maint: location missing publisher (link)
  3. ^ Musil V, Blankova A, Baca V (May 2018). "A plea for an extension of the anatomical nomenclature: The locomotor system". Bosnian Journal of Basic Medical Sciences. 18 (2): 117–125. doi:10.17305/bjbms.2017.2276. PMC 5988530. PMID 29144891.
  4. ^ a b Palastanga N, Field D, Soames R (2006). Anatomy and Human Movement: Structure and Function. Elsevier Health Sciences. pp. 332–333. ISBN 0-7506-8814-9.
  5. ^ a b Gray H (1918). "III. Syndesmology. 5h. Articulation of the Vertebral Column with the Pelvis The Iliolumbar Ligament. Gray, Henry. 1918. Anatomy of the Human Body". www.bartleby.com. p. 306. Retrieved 2021-01-30.
  6. ^ Yamamoto I, Panjabi MM, Oxland TR, Crisco JJ (November 1990). "The Role of the Iliolumbar Ligament in the Lumbosacral Junction". Spine. 15 (11): 1138–1141. doi:10.1097/00007632-199011010-00010. PMID 2267607. S2CID 31100278.