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Microsurgical and endoscopic anatomy of Liliequist's membrane and the prepontine membranes: cadaveric study and clinical implications

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Abstract

Background

Liliequist’s membrane is mostly described as having a diencephalic leaf, mesencephalic leaf, and diencephalic-mesencephalic leaves in the literature. Also different descriptions of the prepontine membranes were reported. In this study, we visualized the regular structural forms of membranes without disturbing any attachments and defined infrachiasmatic and prepontine safety zones. We discussed the clinical significance of these structures.

Materials and methods

The study was carried out on 24 adult human cadavers at the Morgue Specialization Department of the Forensic Medicine Institution following the initial autopsy examination. Liliequist's membrane and the prepontine membranes were explored after retraction of the frontal lobes. Dissections were performed under the operative microscope. A 0- and 30-degree, 2.7-mm angled rigid endoscope (Aesculap, Tuttlingen, Germany) was advanced through the prepontine cistern from the natural holes of membranes, or small holes were opened without damaging the surrounding structures.

Results

The basal arachnoid membrane (BAM) continued as Liliequist's membrane (LM) without any distinct separation in all specimens. The LM coursed over the posterior clinoids and split into two leaves as the diencephalic leaf (DL) and mesencephalic leaf (ML) in 18 specimens; the medial pontomesencephalic membrane (MPMM) coursed anterolaterally as a continuation of the ML and attached to the medial surfaces of the fifth and sixth nerves, joining with the lateral pontomesencephalic membrane (LPMM), which was also a posterolateral continuation of the ML in all specimens. The medial pontomedullar membrane (MPMdM) and lateral pontomedullar membrane (LPMdM) were observed in 21 specimens. The MPMdM membrane was a continuation of the MPMM, and the LPMdM was a continuation of the LPMM in all 21 specimens.

Conclusion

We observed that the LM is a borderless continuation of the BAM. The MPMM and LPMM split from the ML without any interruptions. The MPMdM and LPMdM were a single membrane continuing from the MPMM and LPMM. We determined infrachiasmatic and prepontine areas that can be important for inferior surgical approaches.

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Authors and Affiliations

  1. Department of Neurosurgery, Kocaeli University, School of Medicine, 41380, Umuttepe, Kocaeli, Turkey

    Ihsan Anik, Savas Ceylan & Kenan Koc

  2. National Forensic Institute of Ministry of Justice, Istanbul, Turkey

    Mehtap Tugasaygi, Gozde Sirin, Nurperi Gazioglu & Bulent Sam

  3. Cerrahpasa School of Medicine, Istanbul University, Istanbul, Turkey

    Nurperi Gazioglu

Authors
  1. Ihsan Anik
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  2. Savas Ceylan
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  3. Kenan Koc
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  4. Mehtap Tugasaygi
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  6. Nurperi Gazioglu
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  7. Bulent Sam
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Correspondence to Savas Ceylan.

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Anik, I., Ceylan, S., Koc, K. et al. Microsurgical and endoscopic anatomy of Liliequist's membrane and the prepontine membranes: cadaveric study and clinical implications. Acta Neurochir 153, 1701–1711 (2011). https://doi.org/10.1007/s00701-011-0978-5

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  • DOI: https://doi.org/10.1007/s00701-011-0978-5

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