The facet joint (FJ) recesses at C2–C7 levels.

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The facet joint (FJ) recesses at C2–C7 levels. The facet joint (FJ) recesses at C2–C7 levels. (A) Sagittal view of the FJ spaces (asterisks) and recesses (arrows) of the C2–C7 FJ cavities. Arrowheads point to the synovial folds. Double arrowheads point to the synovial capsule dorsal to the lf which attaches to the vertebral ar. (B) Transverse view of the spaces (asterisks) and recesses (arrows) of the inferior part of the C7/T1 FJ cavity. The inset is a phase-contrast view of the line box in (B), showing that the FJ capsule (double arrowheads) separates the FJ recess (arrows; a real space) from the rs (an adipose potential space) which lies dorsal to the lf. (C) Lateral views of the three-dimensional reconstruction model of the recesses (arrows) and spaces (asterisks) of the C4–C7 FJ cavities with and without vertebrae. (D) Lateral view of a cadaveric specimen showing the partially opened C4–C7 FJ cavities (arrows) with the contrast filling after micro-CT scanning (C). ar, arch; C2–T1, the order of the vertebrae; lf, ligamentum flavum; rs, retrodural space; sg, spinal ganglion; sn, spinal nerve; va, vertebral artery. Bars, 5 mm. Casper G Thorpe Lowis et al. BMJ Open Sport Exerc Med 2018;4:e000338 ©2018 by BMJ Publishing Group Ltd