a: camera obscura b: a device that consists of a lightproof chamber with an aperture fitted with a lens and a shutter through which the image of an object is projected onto a surface for recording (as on film) or for translation into electrical impulses (as for television broadcast). â off camera. 1.
/seÂ·quesÂ·ter/ (se-kwesÂ´ter) 1. to detach or separate abnormally a small portion from the whole. See sequestration and sequestrum. 2. to isolate a constituent of a chemical system by chelation or other means.
The sequestered fragment is often close by, but in some instances can travel quite far from the original location of the extrusion, especially when trauma is the cause of the rupture. This condition is also called a sequestered extrusion, a sequestered fragment or simply a sequestered disc.This article will examine some of the lesser known facts about disc sequestrations, including what happens to disc fragments which float freely in the spinal anatomy.equestered Disc Definition. Sequestrations are the most severe form of disc rupture, but are statistically no more problematic than normal ruptures or extrusions in which the nucleus fragment remains attached to the disc.