The<unk>  (also known as spinal foramen or ependymal<unk>  is the cerebrospinal fluid-filled space that runs through the spinal cord. The<unk>  lies below and is connected to the ventricular system of the brain, from which it receives cerebrospinal fluid, and shares the same ependymal lining. The<unk>  helps to transport nutrients to the spinal cord as well as protect it by cushioning the impact of a force when the spine is affected. The<unk>  represents the adult remainder of the<unk>  cavity of the neural tube. It generally occludes (closes off) with age.
Central canal
Lacrimal groove
Craniopharyngeal canal
Optic recess
Lacrimal sac
Ateronon
Collateral fissure
Orbital septum