Encapsulated Ruffini-like endings in human lumbar facet joints

Journal of Anatomy
F VandenabeeleM Jans

Abstract

The innervation of the human lumbar facet joint capsule was studied by light and electron microscopy. Small numbers of encapsulated corpuscular endings were identified in the dense fibrous layer. Clusters of 2 types of endings were found: small cylindrical corpuscles (type 1) and large fusiform corpuscles (type 2). The corpuscles were classified structurally as Ruffini-type endings. The 1st type was predominant and characterised by a compartmentalised receptor complex, a thin perineurial capsule and a narrow subcapsular space. The 2nd type was characterised by a thicker perineurial capsule, a 'spindle-like' receptive complex, and an extensive subcapsular space with capillaries and concentrically oriented fibroblast-like cells. Both types of endings were innervated mainly by thinly myelinated group III (A delta) and unmyelinated group IV (C) nerve fibres that branched and terminated in the receptor complex. Their sensory endings were intimately related to the collagen fibre bundles as multiple enlarged axonal segments ('beads') with ultrastructural features which were characteristic of receptive sites: an accumulation of mitochondria and vesicles, and 'bare' areas of axolemma lacking a Schwann cell investment but covered by a th...Continue Reading

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Citations

Oct 3, 2000·Spine·J D Dishman, R Bulbulian
Aug 10, 2011·Journal of Biomechanical Engineering·Nicolas V JaumardBeth A Winkelstein
Jul 7, 2012·Chiropractic & Manual Therapies·Howard Vernon
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Mar 24, 2005·American Journal of Physical Medicine & Rehabilitation·Johannes BuchmannFrank Haessler
Apr 25, 2008·Advances in Anatomic Pathology·Sergio Piña-Oviedo, Carlos Ortiz-Hidalgo

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