Definition of fornix in English:



  • 1A vaulted or arched structure in the body, in particular.

    • ‘The fornices should be palpated around the cervix for nodules suggestive of endometriosis, and may also be the etiology for fixed adnexa or may result from pelvic inflammatory disease.’
    • ‘This again removes debris that could have hung up at the edge of the keratectomy and not run to the fornices.’
    • ‘Excessively large implants may also compromise the fornices and possibly limit motility.’
    • ‘The anterior part of the septum and the third ventricular roof were deficient with a narrow Monro's foramen and the third ventricular floor was visible through the space between both fornices.’
    • ‘The lateral fornices may be lavaged without manipulation by directing the stream into them.’
    1. 1.1A triangular area of white matter in the mammalian brain between the hippocampus and the hypothalamus.
      • ‘The fornix is an arching, fibrous band of nerve fibers.’
      • ‘Between the two crura of the fornix is a white, triangular lamina, known as the fornical commissure.’
      • ‘Axons of neurons in the hippocampus (a specialized part of the cerebral cortex involved in conscious memory) run in a tract called the fornix, which ends on neurons in the mammillary bodies of the hypothalamus.’
      • ‘The septum pellucidum stretches across the interval between the genu of the corpus collosum and the columns of the fornix, separating the frontal horns of the two lateral ventricles.’
      • ‘The fornix, mamillary bodies, and part of the anterior commissure can also be seen.’


Late 17th century: from Latin, literally arch, vaulted chamber.