GENERAL HISTOLOGY

Detailed explanation-1: -The central canal, also referred to as the spinal foramen or ependymal canal, extends from the conus medullaris in the lumbar spine to the caudal angle of the fourth ventricle and is lined by a single layer of columnar ependymal cells [2]. It represents the remnant of the lumen of the primitive neural tube.

Detailed explanation-2: -CSF entering the fourth ventricle through the cerebral aqueduct can exit to the subarachnoid space of the spinal cord through two lateral apertures and a single, midline median aperture.

Detailed explanation-3: -The fourth ventricle is continuous with the central canal in the spinal cord, as well as three subarachnoid foramina allowing CSF to surround the brainstem and cortices.

Detailed explanation-4: -The central canal of the spinal cord contains cerebrospinal fluid (CSF). CSF constitutes ventricles in the brain. Ventricles are communicating network of cavities in the brain which are filled with CSF.