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Related Experiment Videos

The suboccipital ligament.

Kelsey Alabaster1, M Fred Bugg2,3, Bruno Splavski4

  • 11College of Medicine and.

Journal of Neurosurgery
|April 15, 2017
PubMed
Summary
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Researchers have identified and named a distinct fibrous structure at the posterior craniocervical junction as the "suboccipital ligament." This ligament shows unique histological differences in patients with Chiari Type I malformations.

Area of Science:

  • Anatomy
  • Histology
  • Neurosurgery

Background:

  • A fibrous structure at the posterior craniocervical junction, dorsal to the dura, has been consistently observed but not formally defined or named.
  • This structure connects the occipital condyles to the C-1 laminae and is partially covered by the occipital bone.

Purpose of the Study:

  • To define, name, and characterize a previously undescribed fibrous structure at the posterior craniocervical junction.
  • To investigate the anatomical dimensions, hypothesized function, and histological composition of this structure.
  • To compare histological differences between patients with Chiari Type I malformations and those with other posterior fossa pathologies.

Main Methods:

  • A 3-year study involving 10 cadaveric specimens and 39 clinical patients (31 with Chiari Type I malformations, 8 with other posterior fossa pathologies).
Keywords:
BMI = body mass indexCM-I = Chiari malformation Type IChiari I malformationMPF = medium-power magnification fieldanatomyatlantooccipital ligamentdural bandposterior atlantooccipital membranesuboccipital approachsuboccipital ligament

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  • Analysis included measurement of dimensions, functional hypothesis, histological examination, and comparison between patient subgroups.
  • Statistical evaluation of parameters and correlations with patient characteristics were performed.

    • Main Results:

    • The suboccipital ligament is composed of horizontally oriented hyaline fibers with median dimensions of 35 mm (length), 10 mm (height), and 0.5 mm (thickness).
    • No significant differences in dimensions were found between Chiari Type I malformation patients and other patient groups.
    • Histological analysis revealed disorganized collagen bands, interspersed adipose tissue, hyalinized fibrosis, and altered fiber orientation in Chiari Type I malformation patients compared to others.

    Conclusions:

    • The suboccipital ligament, extending between the occipital condyle and C-1 lamina, functions as a distinct anatomical ligament.
    • It is situated ventral to the occipital bone and has varying degrees of attachment to the dura.
    • The unique anatomy and histological characteristics, particularly in Chiari Type I malformation patients, warrant its formal designation as the suboccipital ligament.