anterior median fissure of spinal cord anterior median fissure of spinal cord the anterior median fissure of the spinal cord has an average depth of about 3 mm, but this is increased in the lower part of the spinal cord. anterior median fissure of spinal corda spinal nerve with its anterior and posterior roots.transverse section of the spinal cord in the mid-thoracic region.detailsidentifierslatinfissura mediana anterior medullae spinalista98a14.1.02.007ta26053fma83735anatomical terminology it contains a double fold of pia mater, and its floor is formed by a transverse band of white matter, the anterior white commissure, which is perforated by blood vessels on their way to or from the central part of the spinal cord. the anterior median fissure provides a groove in which the anterior spinal artery sits. from here, it provides the anterior part of the spinal cord. it is sourced from the segmental medullary arteries and the segmental spinal arteries which are sourced from the intercostal arteries. the anterior median fissure (amf) may be identified on computerized tomography (ct) myelograms, but more commonly on magnetic resonance imaging (mri) scans. the amf has a characteristic appearance on mri scans that differs from the mri appearance of the central canal. additional images diagrams of the medulla spinalis.